A popular numbers joke is:
 
Q: Why is 6 afraid of 7?
A: Because 7 8 9.” 
 
A possibly politically incorrect numbers joke about the September 11, 2001 attacks on the World Trade Center is:
 
Q: Why did 10 die?
A: Because he was in the middle of 9/11.
 
The joke was cited on reddit on August 5, 2015. Jokes about the 9/11 tragedy, however, are usually inappropriate.
 
“Why can’t New Yorkers play chess?”/“They’re missing two towers” is another joke about 9/11.
 
 
reddit
Why did 10 die?
submitted August 5, 2015 by IAmAMoonAMA
Because he was in the middle of 9/11
 
Twitter
me
‏@not_actuallyme
Why did 10 die? via /r/Jokes http://ift.tt/1eU9EQ3
8:02 PM - 5 Aug 2015
 
Twitter
ΛMΣZΛ
‏@a_meza_ing
Why did 10 die?
Because he was in the middle of 9/11
8:29 PM - 5 Aug 2015
 
reddit
Why did 10 die?
submitted August 17, 2015 by theboss1248
He was in the middle of 9/11.
 
reddit
Why did 10 die (self.AntiJokes)
submitted August 17, 2015 by TheCasualSpider
Because when 7 8 9 he slumped into a depression and began abusing prescription drugs and alcohol to help ease the pain until he finally decided to end it all by hanging himself
   
Facebook
Creamy Memes Can’t Melt Steel Beans
August 17, 2015 ·
Why did 10 die? He was in the middle of 9/11
 
reddit
Why did 10 die?
submitted May 6, 2016 by MidOFeed
10 was in the middle of 9/11