Well since I have spent most of my career working on CNC equipment lathes, machining centers mostly. There are quite a few stories one time we were troubleshooting and intermittent spindle problem on a 30 hp lathe. Well it stopped an there was nothing to do but go in the cabinet with lots of kit so you could not move easily and a multi v belt pulley (the better to cut fingers off). Found the problem shortly a micro switch was out of adjustment. All of a sudden the switch clicked it and WHOOSH motor starts at full speed. I scramble out as the operator is doing emergency stop. We both look at each other and he asks "Are you ok?" I respond with "Yes I think so" as I'm counting fingers. Thankfully things are a lot more safe these days. Lost a few friends from the Good Old Days.