Knock knock.
Who's there?
Lemon.
Haha! Hahahah! Hahahaah!
Knock knock.
Who's there?
Lemon.
Haha! Hahahah! Hahahaah!
Alright listen up, buttercup. This is a knock-knock joke. The joke is that the person says "Lemon" and you're supposed to say "Lemon who?" and then they say a joke about lemon. But instead, they just start laughing. It's funny because it doesn't make sense, kinda like you trying to parallel park. You're welcome.