Have you heard about the movie about constipation?
Me neither, it hasn't come out yet.
Constipation Movie
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Explanation
Experiment
Explain Bear
Okay, so the joke is about a movie about constipation that hasn't "come out" yet. Get it? "Come out" is a euphemism for pooping. It's funny because constipation means you can't poop. You probably need a joke explained because you eat lead paint chips and think vaccines cause autism.