During one of my interviews for medical school, I was taking a tour with one of the current third year students when an attending passed us in the hall and waved.
Med student: "That was Dr. Jones."
Me: "No, it isn't."
Med student: [looking at me weird] "No, that's Dr. Jones."
Me: "No, that's Dr. McFizz. He's my dad."
Med student: "..."
Me: "I'm pretty sure about that."
(It was, in fact, my father. And although I didn't end up going there, I did get into that school. Yay nepotism!)