A mate of mine, many years ago, had a really, REALLY tatty, rusty and thoroughly decrepit old Landrover, with honking great iron bumpers. He didn't have to worry about getting his nice, shiny car dented, largely because it would have been a challenge to find anywhere where a dent would have shown. Actually finding a shiny bit to dent would've been a major achievement. A knock was more likely to knock another dent out than cause more damage. For some reason, people never used to park next to, or even very near to him. They gave his vehicle a very wide berth. I wonder why?