I was jokeing about 9/11 but I forgot the joke. This really fell threw
Was this meant to be the punchline? I'm not laughing.
It was just a joke and it fell threw.
9/11 was the single most worst disaster as an American and I feel that it is inappropriate for you to make fun of the event. People have died and people suffered and continuing to suffer today because of the debris dust that day. Watch the documentary 9/11: I Was There to know about people's stories about 9/11 and so you wouldn't be inclined to joke about them.
I just don't care. 9/11 was a joke.
Saying such things might leave the survivors feeling offended if they were to hear you. Try being respectful of those who survived and find something else to joke about instead.