The only two significant instances that come to my mind are some 20 years ago when I was riding my mother's 5-speed and was rearended and when I was run off of the road by a JAM and into an overturned wood and concrete bus stop bench.

Yeah, like everyone here, I've had more than my fair share of close calls with motorists that have passed too closely or that have come up behind me and really lay on their horn or rev their engine.