I was at a Sabres game once as a kid, with my stepfather. We had seats pretty close to the ice, somewhere behind and off to the side of the penalty boxes. During the game, a player shot the puck around behind the net, but it was up high on the tall glass. Since the glass along the rest of the ice is shorter, the puck eventually flew around the glass and off into the stands. It ended up hitting my stepfather in the shoulder. It was a rocket, and it hurt him pretty good.
If I had been sitting in his seat instead, that puck would have nailed me right in the side of the head. Game over.