Apparently during the Saturday showing, somebody threw a football at the screen and almost broke it. It was intense on Sunday, but thankfully less intense. The entire event felt a little like the meeting of a secret society. The movie is so bad that an audience can easily be kept entertained throughout its length by simply reacting in predefined ways to its awfulness. Plastic spoons are thrown at the stage when an inexplicable painting of a spoon is shown. Footballs are passed around when an inexplicable football is being thrown around by the characters. The audience chants “Go! Go! Go! Go! Go!” over an overlong (and inexplicable) tracking shot of the Golden Gate Bridge (which has nothing to with the movie). The audience shouts “Meanwhile in San Francisco” is shouted whenever (and it’s often) an expository shot of San Francisco is shown, only to have the action return to the titular room. It goes on.
I would recommend seeing the movie first, maybe with a couple of people who haven’t seen it either. For one thing, you’ll hear almost none of the dialogue in the cinema over the shouts of people quoting the dialogue. For another, I suspect that the true badness of the movie comes out more when you can see it taking itself seriously, without the crowd.
The screening is, of course, more of an event than a movie, and so I can’t review it as a movie as much as an activity. I went with three other people, two of whom loved it and one of whom didn’t like it, so it really is a matter of taste more than anything. It’s incredible fun if you like that sort of thing. If not, you might feel left out and bored. It’s certainly a totally different event than the usual midnight screening.