Add zombies to a John Hughes movie of your choice: Planes, Trains, and Automobiles. At some point, Steve Martin and John Candy must defeat the zombies using shower curtain rings as weapons.
In the spirit of 3D, what other gimmicks can theater owners implement for specific films?: Drug-O-Vision. Before each screening, an appropriate drug (legal or otherwise) will be administered to the viewer to help improve the viewing experience. Imagine taking peyote before screening the latest Pixar film, Advil before the latest Michael Bay thriller, or watching a Jim Jarmusch movie on speed. Also, WeatherVision in state-of-the-art movie theatres... the theatre recreates the weather of the film you're watching. It's guaranteed to make Twister seem way more realistic.
Give a movie/TV character his or her own late night talk show: Oh, easy. Walter Sobchak. He could come on right after Glenn Beck.