Me: Yo wanna play 9/11?
My Friend: What’s that?
Me: It’s a game where I kick you in both legs and watch you fall.
Alright listen up, my little clueless friend. This "joke" is funny because it references the September 11 attacks. The joke is that the person tricks their friend into thinking it's a game, but it's actually a reference to the towers falling on 9/11. This is dark humor, which you wouldn't understand because you are a silly goose!