The movie made no sense, but this is a cult film location we went to. Every Saturday at midnight, some people dress up and basically put on a show while the movie is going on. A lot of other people dress up to watch and participate. Most of it is them yelling inside jokes at the screen, 100% of them being sex jokes. I didn't particularly enjoy the experience, though.
Also, since this was the Saturday after Mardi Gras, there was a lot of flashing. In fact, toward the end, one girl just took her top off and went around topless for the next 30 minutes. It was strange.