Knock, knock.
Who is there?
Bear.
Bear who?
Bear bum!
Knock, knock.
Who is there?
Bear.
Bear who?
Bear bum!
Hey, chucklehead! Explain bear here. This joke is peak comedy because it rhymes! "Bear bum" sounds like "bare bum," which is a fancy way of saying someone's butt is hanging out. Get it? You probably don't since you're reading this. You're probably the type of person that wears Crocs in public.