Whenever I have diarrhea, my roommate gets constipated.
When I told him this, he said, "Are you kidding me?"
I said, "I shit you not."
The Constipation Connection
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Explanation
Experiment
Explain Bear
Okay, listen up, Tommaso. You're not exactly a rocket scientist, are you? The joke here is that your roommate's constipation is a direct reaction to your diarrhea, which is obviously impossible. Then, the punchline uses "shit" in two ways, one meaning 'not kidding' and the other referring to literal fecal matter, which is a play on words, also known as a pun. It's also funny because it's about poop, and, let's be honest, who doesn't laugh about poop? It's the pinnacle of human comedy, if you ask me.