Restaurant health guidelines may vary by region, but there are certain violations that get Internet critics all revved up. After a photo of a barefoot worker preparing food in a Taco John's kitchen in Charles City, Iowa, made its rounds online, the woman was fired for violating company policy and state health regulations, according to the Des Moines Register.
A customer complained, saying an employee "was preparing food in her bare feet and was wearing a tank top and was sweating badly and handling food," the Des Moines Register reported.
In response to the photo that was posted on Taco John's Facebook page, the company said on Facebook, "Taco John's takes health requirements very seriously. We've followed up with both the restaurant and the original poster of this image to resolve the situation."
Here's more about the shoeless-worker photo and eight other examples of fast-food mayhem that made the rounds on the Internet.
The barefoot Taco John's employee in Iowa is a 31-year old team leader at the restaurant who had mowed the grass outside the franchise earlier in August, then walked into the kitchen area that was visible to the customer, the Des Moines Register reported.
The original customer who snapped the photo included a caption that read: "This woman was preparing food with bare feet, no uniform, her bra and chest hanging out all over the place, she was pouring sweat, wiping it off with her hands and not washing them. I asked for the manager — she WAS the manager!! She was extremely rude because I was upset with her appearance and behavior."
The Register reported that the employee made the food for her and her friends, but did not pay for it, a violation of company policy.
In a statement provided by a spokeswoman for Taco John's, the company said it first became aware of the situation last August and immediately contacted the owners of the Taco John's franchise.
"We worked with the franchise owners who were very responsive, and handled the matter immediately," Taco John's statement read. "Of course, our standards require that franchisee employees wear uniforms, including safety shoes and hats or visors while working in the restaurant. It is never acceptable for workers to work barefoot or in skimpy clothing.
"The franchise owners of this location immediately investigated the situation and took appropriate actions," the statement continued. "The franchise owners regret that this situation occurred and have apologized to their guests for the bad judgment and poor behavior of their employee. However, we trust that guests will give this Taco John's another chance to earn their business!"
Irresistible Frosty Machine
A photo of a Wendy's employee streaming ice cream from the soft serve Frosty machine directly into his mouth made the Internet rounds in June.
The photo, posted on the content-sharing site Reddit, came with this note from a customer: "I was going to buy a Frosty from Wendy's until I saw the employee do this."
"The photo isn't funny to us," a spokesman for Wendy's told ABC News.
The photo showed a male Wendy's employee on his knees eating directly from the Frosty machine.
The angle of the photographer seems to indicate the Wendy's image was captured by a fellow employee behind the counter, which Reddit users pointed out.
A Wendy's spokesman said the incident involves a single Wendy's franchise restaurant.
"The photo isn't funny to us. The incident was totally inappropriate, and we're taking it very seriously. We've contacted the franchisee who is taking swift action," the spokesman said in the summer, declining to comment on the location of the franchise.
Wendy's says it is the third-largest fast food hamburger company. It has more than 6,500 franchise and company restaurants in the U.S., its territories and 27 countries.
Irresistible Taco Shells
Taco Bell said the taco shells licked by an employee in a viral photo in the summer were not served to customers as part of training for a new product and "were in the process of being thrown out," but the employee has been fired.
The product is presumably Cool Ranch Doritos Locos Tacos, which were released in March. The photo shows a man in uniform in a Taco Bell restaurant licking a stack of about 30 taco shells.
"Two employees, however, used them to take a photo for an internal contest in which company and franchise employees could submit for approval photos of themselves enjoying their first bite of the product," Taco Bell said in a statement on its website. "The contest had clear guidelines about what was acceptable and unacceptable. This image was clearly unacceptable – it violated the rules and spirit of the contest, and the employees never submitted it. But an employee posted it on a personal social media page in violation of the franchisee's policies, and it emerged online in social media."
The company, owned by Yum! Brands!, said it was investigating and the franchisee was cooperating fully.
The company, whose sales have skyrocketed in the last year because of its Doritos Locos tacos, said the taco shells were "absolutely not" served to customers.
"The taco shells were sent to restaurants for training purposes before the new product launch, so team members could use them to practice making the new product before it became available to the public," the company said on Monday on its website. "These shells were a part of that training, were never intended to be served to customers, and were discarded. This is standard operating procedure, and our franchisee confirmed this protocol."
A spokesman said the company has not disclosed information about the store location.
"We do not believe these employees harmed, or intended to harm, anyone. But we deplore the impressions this has caused to our customers, fans, franchisees, and team members," the company said on its website. "The behavior is unacceptable for people working in a restaurant. Our franchisee is responsible for the employment and conduct of his restaurant's employees and he has informed us that he immediately suspended the employee shown in the photo and is in the process of terminating his employment. The employee who took the photo no longer works there. As we complete our investigation we will work with our franchisee to implement any additional action we find appropriate to address this situation and ensure it never happens again."
Irresistible Mashed Potatoes
Earlier this year, an employee of KFC in Johnson City, Tenn., was fired after posting a photo on Facebook of her appearing to lick, or close to licking, a pile of mashed potatoes.
KFC said customers did not receive those potatoes, but the worker who took the photo and the pictured employee were fired. The corporate office also sent to that restaurant a quality assurance team after the incident to "reinforce" the company's standards.
"Nothing is more important to KFC than food safety," according to a statement provided to The Johnson City Press in February. "As soon as our franchisee became aware of the issue, immediate action was taken. The franchisee's investigation confirmed the photos were taken after the restaurant was closed and none of the food was served. The employee involved was immediately terminated."
A spokesman for Yum! Brands, which owns KFC, declined to comment further to ABC News.
'Lettuce' Stand for Cleanliness
In the summer of 2012, a photo of a Burger King employee standing in two containers of lettuce was posted on online bulletin 4Chan, with the words: "this is the lettuce you eat at Burger King."
Internet users tracked the photo to a restaurant in Mayfield Heights, Ohio, leading Burger King to fire three employees who were involved. The company said the restaurant in question "is independently owned and operated by a Burger King franchisee," the Los Angeles Times reported.
A statement from the company said Burger King has "stringent food handling procedures," as reported previously by ABC News. "Food safety is a top priority at all Burger King restaurants and the company maintains a zero-tolerance policy against any violations such as the one in question."
Burger King did not respond to a request from ABC News.
Worker Urinates, Tweets Photo
Also last year, a Taco Bell employee in Fort Wayne, Ind., tweeted a photo of himself urinating on a plate of nachos, tagged "#pissolympics," "#nacobellgrande," and "guess where I work".
Though the employee pointed out that the food was thrown away, he was fired.
The Allen County Health Department said workers at that location would be given mandatory training, Indiana News Center reported.
Taco Bell said it took the incident seriously:
"Nothing is more important than the safety of our customers and team members," Taco Bell said, as reported by the Indiana News Center. "We have strict food handling procedures and zero tolerance for any violations. As soon as we learned of the situation, we immediately investigated and found the photo was an ill-conceived prank and the food was never served to customers. We find this prank absolutely unacceptable, and we plan to terminate anyone involved and work with authorities to pursue legal action."
Taco Bell declined to comment further to ABC News about this incident.
McD's Worker Spits in Customers' Drinks
In April 2012, a McDonald's worker in South Carolina was allegedly caught by surveillance video spitting in two customers' cups of iced tea and arrested, the Associated Press reported.
A spokesman for the Greenville County police told ABC News the charges were dismissed but declined to elaborate.
Customers had reportedly brought the drinks back to the counter because they were not sweet enough. After tasting their new drinks, the customers said they discovered phlegm when adding more sugar because the drinks were still not sweet enough, the AP reported.
The owner of the McDonald's restaurant said he follows stringent food safety procedures and "asked people not to reach conclusions until all the facts come out," the AP reported.
McDonald's did not respond to a request for comment.
Domino's Worker's Creative Video Captures Food Tampering
Back in April 2009, an employee of Domino's pizza shared a video online of another worker putting cheese up his nose, blowing mucous on a sandwich and putting a sponge intended to wash dishes between his buttocks.
The worker said none of the food was delivered and the video was a hoax, but the employees involved were fired.
Domino's said it immediately contacted the franchise owner, re-staffed the restaurant, and posted an apology on YouTube featuring then President Patrick Doyle, who later became CEO in 2010.
"We sincerely apologize for this incident," said Doyle. "We thank members of the online community who quickly alerted us and allowed us to take immediate action."
A spokesman for Domino's said that looking back four years ago, the incident "was a flash in the pan; a well-publicized annoyance more than it was a global reputation crisis."
"It lives on mainly as a PR and crisis communication case study. Our brand, even at the time, was much too strong to be brought down by the errant act of two misguided individuals. It is even stronger today," he said.
He said Domino's ended the 2009 year with positive same store sales and has reported annual positive sales growth from 2009 through 2012 and the first quarter of 2013.
The spokesman said the company learned "the combined power of social media AND being truthful and honest in your approach to issues. Because we confronted this head-on and didn't try to hide from it or ignore, we got people's respect."