Audience participation movies

For a long time, movies have sometimes been filmed with alternate endings. my idea requires many multiple endings (because of some stupid math thing with exponents), plus multiple segments within the film, a responsive projector operator and little electronic buttons on the chairs in the theatre.

The movie would be shot in first person, kinda like those virtual roller coaster things, only with a plot. when a major turning point arrives, a list of choices shows up on the screen, and the audience has a minute to vote for what they want to happen next, using the buttons (button 1 for choice 1, etc). The projectioner then looks at a computer monitor which tabulates the votes, and he puts on the corrensponding film reel.

Added bonus, you could go to the same movie and see something different each time.