Tuesday, September 21Paying $8 to see a movie that stinks is a bitter pill to swallow -- but what if you went to the movies, knowing nothing at all about what you would be seeing, not even the title, certain only that the movie well and truly sucks? Would you go then? If you answered yes, the inaugural Bad Movie Nightat the Commonspace (615 North Grand Boulevard; 314-531-1707; free) is for you. At 7:30 p.m., a movie so bad its name cannot even be uttered by decent human beings (not really; the Commonspace is just keeping it under wraps to heighten the horror) screens, and you're sure to love it if only because this mystery film is so piteous. It's sad really, but in that gleeful, MST3K sort of way.