Authorities in Philadelphia say several men who robbed a gas station stuck around afterward and pumped gas there, offering a discount to those who paid cash.
Police tell a TV station (KYW) that the robbers probably felt they didn't get enough money in the stickup, during which they fired a shot that grazed the clerk -- so they decided to stay and try to get more money.
The clerk's father says his son was told by the robbers to stay in the bathroom for two hours.
The robbers are still at large.