Xanadu
I had received an invitation to see this last night and I took a trivia buddy with me. I get there to pick up my tickets and I was told I had to read this disclaimer before I could go into the theater. Bascially it said that once we were seated, we could not leave until the show was over, no eating/drinking, and no singing along with the music. Why this unusual request? Because my seats were on the stage itself.
It was weird viewing it from the stage point of view, in that most of the time their backs were turned so we couldn't see their facial expressions. This stage production was a spoof of the movie; because I never saw it, I missed out on some of the jokes. But I had a good time, plus my tix were free.