“What’s the worst name for a history lesson?”/“A crash course on 9/11.”

Jokes about the September 11, 2001 terrorist attacks on New York City’s World Trade Center are numerous, although not politically correct. One such politically incorrect joke is:
   
Q: What’s the worst name for a history lesson?
A: “A crash course on 9/11.”
 
The joke was posted on Reddit—Jokes on February 13, 2017.
   
       
Wikipedia: World Trade Center (1973-2001)
The World Trade Center was a large complex of seven buildings in Lower Manhattan, New York City, United States. It featured landmark twin towers, which opened on April 4, 1973, and were destroyed in the September 11 attacks, with 7 World Trade Center collapsing later that day due to the damage it suffered when the twin towers collapsed that morning. The other buildings in the complex were severely damaged by the collapse of the twin towers, and their ruins were eventually demolished.
 
Google Groups: alt.sixtyplus
Manuscrips
Lloyd Lewellen
2/2/04
(...)
Many Americans do not feel they need to be educated about Islam or whatever because they have already received a crash course on 9/11.
   
Twitter
Truthordeal
‏@Truthordeal
Would it be inconsiderate to ask for a crash course on 9/11?
11:07 PM - 29 Jul 2015
 
Twitter
George Deplorable D
‏@georgedarsey
George Deplorable D Retweeted Miss Quita` C
@SexiestPatriot Yes, we got a literal “crash” course on 9/11/01. Muslim culture is incompatible with others.George Deplorable D added,
Miss Quita` C @MarquitaChisho1
HELL I KNOW ENOUGH TO KNOW #IslamIsTheProblem https://twitter.com/SexiestPatriot/status/674324317472067587 …
10:07 PM - 8 Dec 2015
 
Twitter
Beth
‏@samarimom
@pwthornton most Americans had a crash course on 9/11 in case you forgot I do know some really nice Muslims but that does not make me blind
12:55 PM - 10 Feb 2017
 
Reddit—Jokes
What’s the worst name for a history lesson?
submitted February 13, 2017 by JoekesAPlenty
A crash course on 9/11