Answer: Played a tape of John nude in the audio/visual section of a department store
It was a video of Ariel doing a sculpture of John in the nude and Max just so happened to be taping it on his camcorder at the time. Later in the film, he takes it to Sears or whatever, goes to the audio/visual section and puts the tape in one of the VCRs. Needless to say, everyone saw John in the buff and started clapping and poor John was embarrassed. This scene was too funny!