I'm going to assume that all of us who were alive and old enough to understand things remember exactly what we were doing when the U.S. was attacked on September 11th, 2001.

Well, here's what Paul told Yahoo! about that day:

"I was on my way back to England, and we were at JFK on the tarmac, and the pilot just suddenly said, 'We can't take off.  We're going to have to go back to base.'

"And out of the window on the right-hand side of the airplane, you could see the twin towers.  You could see one plume of smoke, and then you could see two shortly thereafter.

"I said, 'Well, that's an optical illusion, you know.'  Then one of the stewards came to me and said, 'Look, there's been something really serious happened in New York, and we've got to get you out of here.'

"I ended up in Long Island watching it on TV, watching the whole story unfold like everyone else in the world…wanting to go into New York, but nobody was allowed back in."

(Yahoo!)

A few other celebs told their 9/11 stories, including Roseanne Cash, Al Pachino, Nick Nolte and more. You can read all of them here.