It's at this point that I may have stepped into the twilight zone, because the guy starts ranting about how this is his day job and how he pushes carts for a living. This goes on for a few minutes (at least while I get to my car and load my stuff). I'm flabbergasted - I have no clue how to respond to this, so I just get to my car and leave.
I was probably rude because I didn't say anything to him after I asked how he was doing, but I was honestly speechless. Like I said, not bad service, just uncomfortably weird.
EDIT: I realize that this is probably not the best place to put it - is there a community where this would fit better - maybe one for general WTF moments?