Funny story: This guy from my school added me on facebook and I accepted the friend request. A week or two later, I uploaded a profile picture and this is pretty much what happened:
Him: oh, i thought you were someone else. sorry! the confusion began because we have josh as a mutual friend
Me: There's someone else with my exact same name?
Him: yeah
Me: That's coincidence for you
A month or two later, he uploaded a profile picture. It wasn't a guy from school. It was some other random with the exact same name as the guy from school. I unfriended him.