I had a really strange one just this week. I was in an exit row aisle and I was one of the last pax to board. A woman in her mid 20s was in the middle seat. I sat down and a second later she said "Sh!t!" quite loudly. I asked her what was wrong. "Well, I don't have very much room," she said. "Neither do I," I replied. That was the last we said to each other for the 2hr+ flight.
I am not a midget but then I am not obese either and I try to be very courteous when in Y in terms of letting the other person use the armrest etc. I didn't really appreciate the greeting I got from this young lady.