I'll admit, the 9/11-joke is in poor-taste, but understand that many find that sort of humor funny. Likely because they distance themselves from the tragedy of the event and use humor to cope. It's included for two reasons. It was one of the most upvoted clips in the thread, and this is a video covering the most upvoted clips in the thread (1+1=2). Secondly, I did not think this video would go viral like this, so I did not think about preparing this video for a large audience.
I'm sorry if it's inclusion offends you.
Original description from June 14:
If you didn't make it, comment which clip made you 'lose it'. :)