Commercial- and film-maker responsible for the "rockumentary" This Is Spinal Tap (as well as the dog food commercial where the dog chases the covered wagon under the sink). Spinal Tap now refer to him as "the butcher" and "the hack" because they feel the movie does not accurately depict them (for example, the film shows a stage equipment malfunction where Derek Smalls is trapped inside a transparent plastic pod for a full song -- Derek notes in a June 1992 interview with Rip magazine, "Most nights I got out of the pod straight away.") DiBergi bears an odd resemblance to Rob Reiner.