I had a Yamaha wave runner once and it was fun at first, but quickly got boring. You can only go in tight circles do long before you get bored. Then I took it to the ocean and played with some locals. They were nice, but as we were all shooting through deep water in a bay, trying to get to the ocean over some shallow sandbars, I released the throttle and a guy yelled "don't slow down."
I lost my plane, started to draft, and then went straight over the handle bars, landing in a head and back combination, just like Christopher Reeve. I got lucky and only suffered soft tissue damage and a shattered ego.