KNOCK-KNOCK KATASTROPHE!
A series of escalating knock-knock jokes, each more catastrophic than the last.
Go to Level 1: The Knock-Knock Heard 'Round the World
Go to Level 2: The Knock-Knock That Knocked the Door Off Its Hinges
Go to Level 3: The Knock-Knock That Knocked the Whole Neighborhood to the Ground
Go to Level 4: The Knock-Knock That Knocked the City to the Ground
Go to Level 5: The Knock-Knock That Knocked the Whole Country to the Ground