Petra Verkaik, a 22-year-old native Californian, celebrated the signing of her Playmate contract in an unusual fashion: by running herself over with her own van. The venerable '76 Volkswagen has a habit of not starting, so Petra's accustomed to climbing under the chassis, armed with a screwdriver, to get things going. This time, in her excitement about becoming a Playmate, she neglected to check whether or not the transmission was in gear. When the motor turned over, the van lurched onto her chest and perched there for about 30 seconds. "A very long thirty seconds," she says. "I thought I was going to die." With a mighty effort -- "I'm not Hercules or anything, but it's a light car" -- Petra managed to free herself, sort of. "I pushed it up and slid under it. Then it landed on my hair, pinning me." Fortunately, the episode took place in the parking lot next to Playboy's West Coast offices, and rescue was soon at hand.