"The record for speedreading was broken by multiple New Yorkers in 2001 when they sped through over 100 stories in under a minute"

That's the only 9/11 oneliner I can think of but there's a lot of joking about it in general

I saw a video on YT Yesterday with 2 decent 9/11 jokes:

"Saying you're a a COD Zombies fan is like saying you're a 9/11 fan, people ask if you mean before or after it all came crashing down"

Which sets up later:

"I apologize for that 9/11 joke. I know for many people it can be shocking, and then the second one hits" followed be a few seconds of silence

Which legitimately got an out loud chuckle out of me

New Yorker here, many of us (or at least most people I know) enjoy a good 9/11 joke. Mostly young people afaik.

I've seen quite a few "A second ___ has hit the ___" memes in my time.