Knock, knock. Who's there? Boo. Boo who? Don't cry, it's just a joke!
Boo Knock-Knock
Explanation
Explain Bear
Listen up, buttercup! This joke is all about wordplay. "Boo who?" sounds like "Boo hoo," which is what people say when they cry. The joke plays on this similarity to create a silly, unexpected punchline. I bet you are one of the people that always falls for this joke, ya dingus!