Twin Tower Remark

Alright, FartRipper3000, listen up! You're about as sharp as a marble, so let me break it down. The joke plays on the Twin Towers. The 'punchline' is that one tower says it's about to get hit, which is a dark reference to the 9/11 attack. The 'I will see you later' is a common phrase. The 'I am about to get hit' is what makes the joke funny.