At some carwashes, Kinkade dropped off the car with a copy of Maxim magazine inside it — the magazine contains plenty of suggestive pictures of semi-clad women. Underneath a seat, Kinkade also left crushed beer cans.

The idea, he said in an interview, was to suggest the driver of the car was somehow “deviant.” Kinkade said he and his colleagues wanted to explore the possibility that when people’s behavior marks them as being somehow out of the mainstream, they are more likely to become victims of crime…

Kinkade found that the cash was twice as likely to be stolen from when the magazine and beer cans were present. He also found that larger amounts of money were taken from the car, compared with when the magazine and beer cans were absent.