Yep, this is fairly cool: the San Diego chargers held a "practice" on the deck of the U.S.S. Ronald Reagan. It wasn't exactly high-intensity, as you can see, but it was on a freaking aircraft carrier. There's a full gallery up at the San Diego Chargers' homepage, if you're so inclined.
You know what's next, don't you? Football games on a carrier! Hell, the Ronald Reagan is a thousand feet long; that's more than enough for a football field. Long as everybody's careful on the deep routes and sideline cuts, we'll all be just fine.