[jeffgrant]

Like Looneybin, I go by my middle name, but have all of my official paperwork/etc in my first name.

So when I get a call that says, "Hey [first name], how're things?" I laugh and hang up, because NOBODY in my social circle calls me by that. Hell, only 2 of my life-long friends know my first name, and most others don't even realize that Jeff is my middle name.

Mind you, that can be embarrassing in the Doctor's office or something, when they call me by my first name, and I don't react until the 3rd or 4th call. (I'm just not trained to recognize it).

That usually follows with some sort of sarcastic "you SURE you're [first name]?"