This is pretty simple. I'll post a snap from a movie. The first person to guess the movie correctly wins and posts the next one for people to guess at. The first person to get that one win, posts for the next round, etc., etc., etc..
The only rule I suggest is no posting of "hints". Either somebody knows the film from the photo or they don't. If no one guesses the movie within 2 days the poster may choose to post another photo from the same film or from another film. If the new winner doesn't follow up with a new posting within 2 days the previous winner will maintain control and can post a new photo to be guessed at.
I'll start!
c2s Here are the winners so far. Every so offten the tread will get cleaned. Morph 1 Spidy 1 xray 1 WatUpDawg 1 c2s 2 Symian 4