9/11 Pilot Reveal

best friend makes 9/11 joke.

you: "hey, my dad was inside the tower."

best friend: "I'm sorry."

you: "I always knew he was a great pilot."

Explanation

The joke plays on the dark humor of the 9/11 tragedy. The person claims their dad was "inside the tower" when it was struck by the plane, leading the friend to express sorrow. Then the person jokingly reveals that their dad was actually the pilot, creating a twisted punchline that is both shocking and darkly comedic.