Knock Knock Who's there ! Aardvark ! Aardvark who ? Aardvark a million miles for one of your smiles !   Knock Knock Who's there ! Abe ! Abe who ? Abe C D E F G H... !   Knock Knock Who's there ! Ada ! Ada who ? Ada lot for breakfast!   Knock Knock Who's there ! Aesop ! Aesop who ? Aesop I saw a puddy cat !   Knock Knock Who's there ! Al ! Al who ? Al be seeing you!   Knock Knock Who's there ! Canoe ! Canoe who ? Canoe come out and play with me ?   Knock Knock Who's there ! Canon ! Canon who ? Canon open the door then ?