A woman is walking down the street when she bumps into an old friend she hasn't seen in a long time. They sit down on a bench and catch up on their lives.
Friend: So do you have any kids?
Woman: Yes, I have 5 boys.
Friend: Nice! What are their names?
Friend: You mean… All of them are named Steve?
Woman: Exactly, it’s so much easier that way! It’s hard enough to supervise 5 boys playing together, it’s even worse if I have to call them one by one. All I have to do is shout “STEVE!!!” and they all turn around immediately!
Friend: But what if you only want to talk to one of them at a time? How do you differentiate them?
Woman: Oh, well in that case, I just call them by their last name…