I was going to start a similar thread last year when I hurt my back from playing for to long. I have a back injury anyway and after an hour or so I start getting pins and needles in my arm and that's the sign to have a break. I ignored that kept playing and my back was real bad for the next couple of weeks.
Other than that one I have had a sore back from moving machines and two electric shocks from the underside of a playfield from touching things I shouldn't have.....I don't touch anything anymore.
