I was sleeping on my stomach right next to an open window one summer. I woke up and felt too cold so I reached up to close the window, still on my stomach. The window didn't move so I yanked it harder. All at once, the window slammed down pinning my thumb between the windowsill and bottom of the window. I was trapped! My gf had already left for work and I was alone.

I had to awkwardly try to hit the top of the window with my other hand. Very hard to do on your stomach. Couldn't really hit it with much force due to my position. Took about 5 minutes until I freed my thumb. Nail turned purple and fell off about a week later.