The one about the white south african woman who was seated next to a black south african man. She blatently told the flight attendant that she refused to sit next to someone like him as he was below her. The flight attendant said to her "of course madam, i'll fix it straight away for you" turned to the male passenger and told him "sir, this lady refuses to sit next to you, we'll move you to first class so you don't have to sit next to her".
Actually something similar to this happened to me a couple of weeks ago. I was in upperdeck business when a pax approached me very upset saying the lady next to him wanted him moved as he was a snorer and she refused to have him next to her. We had him moved to first class as there were no other seats.