Knock, knock. Who's there? Banana. Banana who? Knock, knock. Who's there? Orange. Orange who? Knock, knock. Who's there? Butter. Butter who? Knock, knock. Who's there? Boo. Boo who? Knock, knock. Who's there? Mustache. Mustache who? Knock, knock. Who's there? Art. Art who? Knock, knock. Who's there? Cargo. Cargo who? Knock, knock. Who's there? Honeydew. Honeydew who? Knock, knock. Who's there? Olive. Olive who? Knock, knock. Who's there? Cereal. Cereal who?