Look, I'm sure a large team of well-trained ropework professionals have decided that ski jumping while attached to a bungee line, attached to a zipline, is a safe thing to do. But every single part of my brain involved with self-preservation is telling me it's a bad idea.
Bun J Ride is an activity in Tignes ski resort in the French Alps. For $US75 ($105), willing victims can ride skis, snowboards, or even tandem sleds down a ski jump. They're attached by two bungee cords to ziplines on either side, which reduces the risk of penduluming around like a lunatic with sharp metal planks attached to your feet.
Despite the obvious safety precautions in place, I would still be nervous about going down. I enjoy the activities of skiing, ziplining, and bungee jumping; I also enjoy Kraft Dinner and champagne, but they're much better one at a time.