We saw this in Leicester Square London when it premiered, we had to go watch cartoons in a small cinema in Piccadilly afterwards, just to get it out of our heads.

In the early 1970's in San Diego, a local cinema would hold midnight movies on Friday night. They always showed really odd, if not totally bizarre movies. I don't think they really cared what movies they showed because the audience was always too stoned to care plus the object of the exercise was to advertise the sister theatre which was a porn movie house. Each movie was shown in two parts with an intermission that contained previews of, ahem, coming attractions at the sister theatre. One movie we saw consisted of a cowboy in the desert, walking towards a fort whilst another cowboy walked away from it, in the opposite direction, nothing was said throughout the entire movie. The camera moved from the cowboys head to endless minutes of watching his boots as he walked, the scene then changed to the other cowboy, this went on for a seriously long time. Being very stoned, most people just sat there and took all of this in. Eventually, the intermission would arrive and without warning, the scene changed from cowboys boots in the desert to that of some nubile young thing in the process of engulfing a rather large erection. It would take about 30 seconds for the scene change to register with the highly stoned audience, at which point a massive cheer would rise up and the entire theatre took on a totally different persona. Wierd stuff indeed.