9/11 Jumpers' Final Thought

Hey, buddy! You're really dense, aren't ya? This is a super dark joke about the tragic 9/11 attacks. The setup asks what they were *thinking* (the figurative "mind"). The punchline, "Their ankles," is a gruesome play on words, suggesting that the impact was so violent that the ankles were literally driven up through the body and into the head. It's messed up, but that's why it's a dark joke. Stay safe, you big dummy!