Ah, yes. I had that experience one day. I was alone in a base barber shop, and the Vietnamese barber was shaving around my ear with a straight razor. He suddenly stopped and put the blade right to my throat. By the look in his eyes and his actions, I knew he was not only enjoying the thought but was making a decision right then and there whether it was worth it to cut my throat and compromise himself. Fortunately for me, he didn't. But there was no doubt in my mind what was going through his.
After experiencing pappa-san with a razor I usually opted for the 1SG and the unit barber kit. Heck, who cared? I sure wasn't trying to impress anyone with my looks.