Go read Danielle's True Stories From Fish Camp:

...The day I broke my thumb, I'm working with Jack. We're in a groove. Pick up rack - SLAM! it down on the board, push up the rack, fish fall out into the glazer. Pick up rack - SLAM!, etc. The Rack That Done Me In had a missing piece in the corner - a piece big enough for you to slip your thumb into. I put my thumb in between the bars, and before I realize what's happening, SLAM!- Jack's still in his groove...