Dentist pulled the wrong tooth when I was in the Army. I had to have the right one pulled after I got out. It was kinda neat, though -- one of the self-righteous anti-everything types was pontificating to me about how awful it had been that I had been in the service immediately after the extraction. I faked a coughing fit and spat a big bloody one into the snow and said, "Damn, I've been doing that since I got back from Korea. They think it's not contagious anymore, though."

He never spoke to me again, which was no loss at all.