Yesterday on the ride home, I was squeezing between an SUV stuck in traffic, and another SUV parked on the right... fairly slowly, but fast enough for my bag, which was sticking out farther than I thought to whack the guy in traffic's mirror. and push it forward (one of those folding kinds) ... whoops.. Luckily he didn't seem angry when I went back to check if I broke it and straightened it for him.