Had a colleague once -- guy -- who had an interview appointment with a doctor. (We were both researchers at a hospital research institute.) This guy had a pretty common name in Norway, Karlsen. The doc also had a pretty common name, like Olsen or Johnson. He shows up for the interview and says something like "Hi, I'm Stein Karlsen here to see Dr. Olsen." Receptionist says, "Oh, there you are! We've been waiting for you! Right this way." and steers him towards the operating room. Turns out another Karlsen had an appointment for a vasectomy with another Dr. Olsen that day. My colleague's youngest son is glad they got that straightened out in time (like when they started asking him to get undressed. "What? For an interview?").