Bullet Time. You know, the special effect used to slow down time in the Matrix and so many commercials? There it is, in the US Patent Office.
The good news for aspiring film makers is there's lots of technical info there explaining how and why the effect works. The bad news is you'll have to pay that guy royalties.
(the sad thing is, even before having an invention to protect, I spent an ungodly amount of time searching the US Patent Database. What can I say? I like to know how things work...)