Several years ago one of my employees got a new car and was really anal about it. When he arrived at work each morning he would take out his special no-scratch duster and brush off his car, I think he would have died if it ever got so much as a scratch in it.
About 2 weeks after he bought it, I went to the car dealer and got a can of touch-up paint, the hardware store for a 5/8" machine bolt 3" long and painted the head of the bolt to match the color of the car. I left it next to the drivers door where he would see it when he went to lunch.
Jim spent the next 2 hours at the dealer with a mechanic going over his car trying to figure out where this important looking bolt came from.