Danny Devito starred as Ralph in this film.
IMDb trivia:
Director Robert Zemeckis asked Danny DeVito to shoot a special promo for the movie. It was to be filmed on a Malibu beach, next to a tall cliff. For the promo, DeVito was strapped into a harness and hoisted fifty feet in the air by a huge crane. When he was in the air, DeVito discovered that there was a house on top of the cliff, with a swimming pool terrace outside. A woman in a bikini was lying on a deck chair next to the pool. She jumped up and began screaming at DeVito, yelling that he was a "peeping Tom", and that she was going to call the police. In a panic, DeVito yelled for the film crew to bring him down at once. The film crew told him that the crane had jammed, and DeVito was left hanging in the air with the screaming woman throwing things at him from the top of the cliff. A few minutes later, the woman told DeVito that he was being filmed for a segment of the TV show, "TV's Bloopers and Practical Jokes".