Knock Knock Who's there ! Aardvark ! Aardvark who ? Aardvark a million miles for one of your smiles !

Knock Knock Who's there ! Aaron ! Aaron who ! Aaron the barber's floor !

Knock Knock Who's there ! Abba ! Abba who ? Abba'out turn ! Quick march!

Knock Knock Who's there ! Abbey ! Abbey who ? Abbey stung me on the nose !

Knock Knock Who's there ! Abe ! Abe who ? Abe C D E F G H... !

Knock Knock Who's there ! Abel ! Abel who ? Abel to see you, ha, ha!

Knock Knock Who's there ! Abyssinia ! Abyssinia who ? Abyssinia when I get back !

Knock Knock Who's there ! Acid ! Acid who ? Acidently on purpose !

Knock Knock Who's there ! Acis ! Acis who ? Acis spades !

Knock Knock Who's there ! Actor ! Actor who ? Actor you, my dear Alphonse !

Knock Knock Who's there ! Ada ! Ada who ? Ada'mond is forever !

Knock Knock Who's there ! Adair ! Adair who ? Adair once but I'm bald now !

Knock Knock Who's there ! Adam ! Adam who ? Adam up and tell me the total !

Knock Knock Who's there ! Adder ! Adder who ? Adder you get in here ?

Knock Knock Who's there ! Adelia ! Adelia who ? Adelia the cards after you cut the pack !

Knock Knock Who's there ! Adeline ! Adeline who ? Adeline extra to the letter !

Knock Knock Who's there ! Adolf ! Adolf who ? Adolf ball hit me in the mouth !

Knock Knock Who's there ! Adore ! Adore who ? Adore stands between us, open up !

Knock Knock Who's there ! A Fred ! A Fred who ? Who's a Fred of the Big Bad Wolf ?

Knock Knock Who's there ! Agatha ! Agatha who ? Agatha headache. Do you have an aspirin ?