I know this sounds amazing, and there's a kicker — you can see these movies in theaters for free BEFORE they're released to the general public!
It sounds too good to be true, but it can be done really easily. For the past year or so, I have been attending movies in theaters before they've been released. I pay nothing to see them, and to top it off, there are often no previews, so 100 minutes actually means 100 minutes.
Some movie studios provide free screenings of movies. They do this to build interest in a movie, to do research, and to allow the press to review it. If people have a good experience, they'll tell their friends and write positive reviews.