Dr Knucklehead's Knock-Knocks Author:Chris Tait Dr. Knucklehead is here, 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 humor--and these are simply the very best. From "Sports Snorts," to "Space Cadets on Your Porch," from "Sick Stuff" to "The Kit and Koboodle," kids will have a laugh riot r... more »epeating 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. Every one is irresistibly funny.« less