Yep, was putting on some stupid plastic platform pedals on a trek 1500 for a customer to test ride.
Simple enough job, was holding the axle with a pedal spanner spinning back to tighten away, and my right index finger (stupidly pointing out) got caught between front derailleur and big chain rig. ouch.
Also, just cut a knuckle 10 mins ago as I was trying to loosen some tight SPD-SL's from my road bike to swap some SPD's on for tomorrow's commute.