At the restaurant where President Obama was working, I was seated across from a guy I knew from high school, as well as the now-deceased Chief Justice of the U.S. Supreme Court, William Rehnquist.
To reduce the demands on President Obama's time when he came around to take our order, I ordered a bag of pretzels, figuring that wouldn't require any prep time once he got back to the kitchen.
Of course, just to be difficult, the conservative Justice Rehnquist ordered some flaming glazed duck monstrosity, and the guy I knew from high school ordered something equally complex.
Having discovered they had something in common, high school guy and Rehnquist proceeded to ignore my polite attempts at conversation, in fact making a point of first moving to another table, then all the way across the room, just to get away from me.
I think the moral of this story is clear.