Not sure if you had a horrible day or this particular guy annoys you on a frequent basis. He was aging, stooped over, clearly drunk, homeless and oblivious that he was holding up the line and causing a minor quagmire. But when you threatened or said something about his throat being slit, don't you think that you were the one overstepping all the bounds? Back home now I realize I should have told you that's bad despite how enraged you were. If you have a shitty and stupid job you probably have to deal with frustration often, maybe you shouldn't be working as a gas station clerk. Don't threaten people's murder so casually. Get some anger management skills. It's not cool to say that shit, even though the guy was obnoxious as hell.