I ran a jetski rental place my nieghbors had back in the early 90's. That was pretty cool, free rides when ever I wanted, and bikini's all summer long. It was funny when the girls that had no idea about riding one needed 'lessons' so to speak. "Here, lemme take yah for a quick ride, and I'll show yah how it works."
People that have no concept of how fast those things go, or just no background in motorcycles/skidoos/quads can sure do a number on them. Constantly running them into the dock when coming in, flipping them over, and yes, hitting each other. Those machines didn't last to long.