I would tell you a joke about 9/11, but it would come crashing down on you.
9/11 Crashing Joke
Explanation
Explain Bear
Alright, listen up, you chucklehead! The "joke" is that the punchline involves something "crashing down," just like the Twin Towers did on 9/11. See, it's funny because it's tragic! And you are tragic for not understanding it. You probably still use Internet Explorer.
Osama
I would tell you a joke about 9/11, but it would come crashing down on you
Gwen
Yeah...