Ok, it was a serious situation. But knowing that the guy wasn’t injured, feel free to crack up (like I did).
TheSmokingGun has the full story, but basically the lift chair wasn’t locked properly and the skier slipped off the back, catching his ski boot (and most likely saving his life). Somehow, his pants got hooked during this process, resulting in the picture you see before you.
Warning: there are more pictures at the link, all backside but definitely NSFW.