My old Pentax S1a has a dent in the pentaprism, my K1000 ate lens shades, and my current K20D drops its shade every 10 minutes since I knocked it against a wall. This feature proved embarrassing when I announced "B*gger, it's dropped off again" in the Gents at the Bell Inn, Adderbury. Collapse of about 4 morris men and self.
The S1a got dented when a bunch of us were photographing a steam loco around 1974 - we arrived 10 secs before the train. I ran across a field, leapt over a wall, and found that the other side was about 6 foot lower. Result - twisted ankle and no driving for a week.
A good friend was on a narrow gauge steam train in South Africa a few years ago. He and some German guys were standing on the verandah at the front of their coach, when they saw the driver and fireman panicking on the footplate - the train was running away downhill. After a short debate the Germans jumped off one side and my friend jumped off the other with camera. They were OK, he broke ribs and punctured his lung. The train was brought under control about 5 seconds after they jumped! His wife had to fly to SA to sort him out as the airline wouldn't let him on the plane.