Plastic sheeting on snow!

As I was skiing yesterday, I went over a loose piece of clear plastic sheeting that must have been blown around and had landed on the ski run. Because it was clear, I wasn't able to see it and, as I was putting my ski on edge and leaning accordingly, I felt a sliding sensation, having both my skis slip laterally from under me.

It was as if the carpet of snow was pulled away by some malevolent elves, and I took a brutal fall, the harsher, as the terrain was fairly flat in that particular area. That weird incident had never happened to me before so I guess I had to live through it to be able to tell the world and (perhaps) learn something in the process. After I picked myself up, I realized to my dismay that I had sprained my left thumb. Another hard lesson that I will remember!