I don't like making 9/11 jokes because every joke about 9/11 I make has a tendency to crash and burn.
Crash and Burn
Explanation
Explain Bear
Listen up, buttercup. This joke is funny because it uses the phrase "crash and burn." "Crash and burn" is like, when something fails spectacularly. 9/11 was a plane crashing into the Twin Towers and burning. Get it now, dummy?