Actors nailing accents is often crucial for a role where they're portraying someone real or from a part of the world known for a specific accent.
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We've all played around with an accent as a goof but have never maybe realized just how difficult it is to make it believable. I'm no expert on accents, but luckily the internet has already provided me with someone who is.
Throughout this post, I'll refer to Erik Singer, a dialect coach who's been in the business for over 15 years and is a part of a long-running segment called Technique Critique with WIRED breaking down all types of accents. I will defer to his videos for some of these takes, though the bad accents are quick to catch since some of these actors didn't even try.