Back in the full-serve days there is a story about a guy who pulled up to a pump, pulled out a gun, and demanded money from the attendant. Turns out that in anticipation the attendant pulled out the nozzle while the guy was pulling up. Once he saw what this guy was up to, he pulled the trigger on the nozzle and doused the guy with gasoline, putting an end to the robbery. No way was the robber gonna pull the trigger covered in gasoline!