Boo Who? And Other Wicked Halloween Knock-Knock Jokes: A Lift-the-Flap Joke BookCelebrate Halloween with this collection of fang tastic knock knock jokes! Join trick or treaters as they adventure through a haunted house full of surprises behind every flap. Knock, knock! Whos there Coffin! Coffin who Coffin from all the dust in here! Enter if you dare! Wander through the haunted house with trick or treaters and lift the flaps for spooky reveals and funny punchlines. These Halloween Day themed jokes promise fun for all ages. The