Funny that you started this thread at the same time that Top-ologist posted his
PhiTopA search of youtube came up with these videos:
the geek (our) way:
There must be a way of doing this forcefully using a kick. But I don't have an American football to try. Or to do a boomerang (challenge made!
).
I also found that you get penalized if done in the middle of a play: "To clarify, an NFL spokesman told deadspin.com that penalties will only be called for ball spinning on non-scoring plays. Inside the endzone, players are free to spin the football to their hearts content"