Knock Knock!
Who's there?
Police.
Police who?
Police stop telling these awful knock, knock jokes!
Knock Knock!
Who's there?
Phyllis.
Phyllis who?
Phyllis up a cup of water!
Knock Knock!
Who's there?
Donna.
Donna who?
Donna sit under the apple tree.
Knock Knock!
Who's there?
Andrew.
Andrew who?
Andrew all over the wall!