It has to be ( most of ) Exorcist. Saw it at midnight years ago for the 1st time in UCI cinemas ( UK )It was still banned for video release so had very little knowledge of it throughout the country. About 50 people watching. Dont think anyone else in screen had watched it, cos at the end of every scene you could hear a sigh of relief it was over and a nevrous bit of laughter at what we had just watched. Right at the start a couple of lads laughed at how old the film looked when starting credits rolled. They were strangely quite later on lol. It is the single best movie moment ever, never mind just a horror one.