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How to make a joke
Joke about yourself.
Using yourself as the butt of your own joke is a sure way to get people cracking up. There's something about self-deprecating humor that triggers schadenfreude, the act of taking pleasure in someone else's pain, and this forms the foundation of many famous comedians' jokes.
Figure out what's sadly hilarious about you and offer it up for laughs. I'm really good in bed.