Fastest Reader

Okay, you, my friend, clearly didn't get this one. Let me break it down for you. You thought 9/11 was a day, but it also refers to a tragic event involving the Twin Towers. The joke uses wordplay, suggesting that the buildings went through 10 'stories' (as in floors) fast, like a fast reader going through books. Get it? It's dark humor and puns, something you're clearly not familiar with.