Well, this wasn't done with a bike or a car.
Anyway, when I was working as a mechanic in Civil Service at Fort Chaffee, my work area was a fair sized room in one of the old motor pool buildings and I worked on Powered Equipment ( Generator sets 1.5 - 100kw, Air Compressors 5cfm - 600cfm, Heaters, Laundry units and such as that). It was Summer time and pretty hot. A number of the smaller generator sets were placed on warehouse trailers in that room and I had to go around to each one, to work on it (I didn't have a wrk bench). On a Monday morning (wouldn't ya know it would be a MONDAY!), I had finished one generator and the next one was a little ways away from the last one and I reposition the floor fan each time. Well, I usually just grasp the pole of the floor fan, carefully pick it up and turn it like I need it and sit it down (without turning it off). Not this time! I picked the fan up, turns it and was preparing to set it down, when I heard the blade hit the guard. I thought, "I'd better set it down, before it hurts me!" Too late, after I set it down, I noticed that my shirt sleeve was torn and my arm was bleeding. I had FOUR lacerations on my left arm that took 60 "running stitches" (still not sure what determines a "Running Stitch"). So now, every time I wear a short sleeve shirt, I am reminded by 4 scars on my left arm (2 of them are slightly above the elbow and 2 just below the elbow. That was about 35yrs ago.