I've been rear-ended three times. Once years ago when I'm sitting at a red light in my old Triumph. It's snowing out, and slippery, and I see car headlights coming up on me too fast. So I try to go through the red to get out of the way. I had time to get moving a bit, but the car hits me anyway - hard enough to push my flimsy bumper in a couple of inches. I get out of the car, and see that it's a cop that hit me! (I'm thinking to myself - Oh boy! Somehow this is going to be my fault!). I went easy on the city by just having my bumper straightened (those old Triumph bumpers bend pretty easy), albeit not perfectly, instead of holding out for a full replacement bumper.
Second and third times I'm in my Ford Expedition, just sitting at a stop light, when cars behind me can't stop in time and smack into me. But in both cases the score was Expedition 2, other cars 0. (Both other cars had non-trivial front-end damage, Expedition rear bumper was not even blemished.) A bike on the back would have been toast, though.