Was making a house call years ago working on an EM machine where I made the playfield vertical so I could clean a score motor. One of the owners kids ran into the machine causing the playfield to slam down and the hundreds of sharp edges to perforate my noggin. I looked like I was hit by a shotgun for a couple of weeks, and it taught me to use one of those orange harbor freight ratchet straps to secure a vertical playfield. Another common pinjury seems to occur more frequently while cleaning playfields and spearing a finger with a one way outlane switch. This is more common on the older Gottlieb games, and you never know where that switch has been That one hurt just typing it out. One final one, and there are many more, but the one that always got me was the small popping sound you hear if you find the 190 volt pins on an early Bally 2518 display. It gets your attention, it smells of burning flesh and it makes a popping sound...the trifecta of pinball injury.