Writing Tips: Never Assume It's FunnyThere's a very memorable scene in Roger Rabbit where the title character almost randomly breaks out of his handcuffs. When asked why he didn't do it sooner he says that he couldn't do it before because it wasn't funny before. Now Roger Rabbit is a great movie, but that one joke doesn't seem to have aged very well. Since 1989, cartoons have become a lot more story-driven, a lot more in depth, and generally less gag-based. Can you get away with breaking logic or continuity if a joke is funny? Yes. Can you get away with having an asshole in your show who is nothing but a sadist as long as he's funny? Yes. Should you ever, ever do it, especially if you're just getting started writing? Hell fucking no.
Let's start with the very, very obvious: if the joke you assumed was funny broke continuity, placed a character out of character, or could destroy the story wasn't funny... then things fall apart. It sounds like common sense, but I can see why some people need to assume that things are funny.