1 / 5

The Debbie Downer

The Debbie Downer On "Saturday Night Live," the Debbie Downer character joins the party only to mention dangerous new diseases, deadly storms, and horrific injuries. No one expects sunshine and rainbows, but ever-present pessimism can be a drag. "We tend to match the moods around us," writes one expert, who suggests turning negativity around by making an effort to say "Thank you," giving compliments, and going in with positive expectations.

Five worst Super Bowl party moves

Recognize any of this behavior? Make sure you don't rank as a terrible guest on the big game day.