When the brilliant Noises Off begins, a troupe of English actors is rehearsing the sex comedyNothing On. As we eavesdrop, the director explains his theatrical philosophy: "Bang you're on. Bang you've said it. Bang you're off." If only things would go that smoothly. But with these thespians, including the dim-witted starlet, the method actor without motivation, and the leading lady on her last legs, it's total chaos and non-stop laughter.