My FIRST TIME EVER in ORD flying for Comair (DL has (had, this was like 2 years ago..not sure if they're still this small) 4 gates in O'Hare).
Lady passenger walks up to me.
lady: "do you know where United flight XXXX is?"
me: "well, not off the top of my head but we can go to these monitors and find out"
lady: "well you WORK here don't you?"
me: "not really, i'm just passing through, I work for a feeder for Delta based in JFK this is my first time here!"
lady: "well fine" and she turns around and storms off
me: ::laughter inside::