Andrea's mention of the Villiage People's magnum opus Can't Stop the Music (Best. Movie. Directed. By. Rhoda's. Mom. Ever.) brought to mind all the other movies, music, and books that I both love and hate. Perhaps you could do a show devoted to these examples of bad art. Perhaps listeners (and/or some invited professionals) could leave phone messages or e-mail you MP3s (limited to 2 minutes or so) talking about their favorite artistic obsessions that they know are bad for them.
Anyone else remember the Sgt. Pepper movie with the Bee Gees? Steve Martin is Maxwell Edison! George Burns is Mr. Kite!