When you accidentally choke your girlfriend to death and then realize that it's your sister so who gives a f**k?
Incestuous Choking
Explanation
Explain Bear
Listen up, buttercup. This joke is all about a dude who accidentally offs his girlfriend, only to find out she's also his sister. The punchline? He doesn't care! It's funny because, well, it ain't supposed to be funny, you chucklehead. It's called dark humor, something you clearly don't understand, given your intellect.