Why did the Twin Towers fall exactly at 9/11?
Because the terrorists thought that it would be fun to call 911 as a "prank."
9/11 Prank Call
Explanation
Explain Bear
Okay, so listen up, nimrod. This joke is dark as heck. It's saying the terrorists attacked the Twin Towers on 9/11 just to pull a sick prank by calling 911. Get it? It's funny because it's so messed up. And you, my friend, probably still use Internet Explorer. Sad!