Who was that guy?

I was at work earlier this week, and was walking towards a guy that they brought in to work on the chillers.  I realize most of you don't know what a chiller is, but its really not that important.  Point is, he doesn't work where I do, he's hired in to work on machinery.

As I approach him, I do the obligatory nod and say hey.  He says "hey Jeff, how's it going?" "I'm good, how about yourself?"  Of course, in my head, I'm thinking who the hell is this guy? How do I know him? He doesn't look familiar to me. How does he know my name?  He responds "not too bad" and we continue to walk away from each other.  And I was still at a loss for a bit when it suddenly hit me, now I know where he got my name.

Dumb ass.

So I’m thinking, when I see someone with their name on their shirt.  I’m going to start talking to them and call them by name.  Just to screw with them.