Okay so I'm going to add more junk to the World Trade Center pile growing out of Seinfeld episodes. Even though of course no one predicted what would happen while filming Seinfeld this one was just errie!
In Season 7 Episode 13 "The Seven", in the beginning of the episode Kramer is about to crack Elaine's neck back into place when he tells her and Jerry that he learned the special pressure points from a wise man. "Yeah, he sells t-shirts outside the World Trade Center.".
There you have it, more World Trade Center gossip! Time to go tell your friends and family the amazing discovery! :)
Scott