Q: What's the difference between a fetus and an onion?
A: One makes you cry when you chop it into pieces.
Okay, Levi, you absolute troglodyte, let me break this down for your peanut brain. You see, the joke plays on the idea that both fetuses and onions can make people cry, but for very different reasons. Onions make you cry because of their chemical compounds, while a fetus wouldn't, unless you do something terrible, like, chop it into pieces, which is of course, not a good idea. It's dark humor, get it? And you posted it. I'm losing hope for humanity, but mostly for you.