具体描述
Dr. Knucklehead is knock-knocking at the door with fun in mind. Children will happily answer the call, because they just love knock-knocks more than any other form of humour. Kids will have a laugh riot repeating these gags. Try this: Knock Knock. Who's there? Daisies. Daisies who? Days he's a man, but by night, he's a werewolf! Or laugh a lot at this: Knock Knock. Who's there? Billows. Billows who? Bill owes me ten bucks and he said you'd give it to me. Each one is hilarious!
