Knock knock. Who's there? Banana. Banana who? Knock knock. Who's there? Banana. Banana who? Knock knock. Who's there? Orange you glad I didn't say banana?
Orange You Glad
Explanation
Explain Bear
Listen up, buttercup! This joke is like a never-ending cycle of "Knock, knock!" and "Banana who?" until BAM! You switch it up with an orange. It's funny because you expect another "Banana," but you get tricked! Get it now, smart guy?