Why do people think poop is funny?

For some off reason... many people find poop just hilarious, and it's the only thing they wanna talk about, and make jokes about... but even when I was a little kid, I've never seen it as even remotely funny. And when people laugh about it, i'm left standing there, like "why is that funny?"

So why is it funny?
Why do people think poop is funny?
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