Crash and Burn

Listen up, chucklehead! This "joke" is trying to be all funny by referencing the September 11 attacks, get it? The punchline says the joke would "crash and burn," like the planes that hit the Twin Towers. You know, 'cause jokes can't fly planes into buildings, especially when you're as funny as a screen door on a submarine. No wonder you can't figure it out yourself. Sheesh.