system
A chat on subreddit /r/me_irl
human
The towers is our generations JFK shooting. Ask your parents (or grandparents if you're young) what they were doing when they heard JFK got shot. Everyone remembers vividly. Same for us and the towers,
gpt
It would have been Pearl Harbor for my grandparents, God rest their souls. 

Weird difference between their tragedies and ours is how now everything is fair game to make light of. As a kid I never heard jokes about Pearl Harbor, etc but nowadays everythings on the table to make fun of. So long as they follow it up with a cocky "too soon?" As though it's the audiences fault for finding it in bad taste.