The problem with the car was the dust tray, which apparently sits under the bumper. But honestly; a dust tray? What would you do with the dust carefully collected in the tray you didn't know was there? Silly.
Managed to have a whole day not being grumpy yesterday. Major achievement. But I'm tired again today, so I'll have to try again not to be grumpy. But at least for diversionary amusement I can think of diverse reasons why one would have a dust tray under the bumper of a car.