Who are the world's fastest readers?
9/11 victims; they went through 91 stories in 11 seconds.
Alright listen up, genius. This joke is a dark play on the tragic events of 9/11. The "fastest readers" are the victims who fell from the Twin Towers, implying they "read" through 91 stories (floors) of the building in just 11 seconds. It's not funny, just like you at parties.