About 10 years ago, on a charter out of LGW on a Caledonian Tristar, 1 hour into the flight a woman presses call bell, i walk up and ask what i could do for her, when she said i am worried we have been flying over that silver thing for over an hour is it suppossed to be there. I explained that i hoped so as it was the WING!.
Another time all the ovens were us so we were offering afternoon tea, when a pax says hey you are you stupid, you should know that i do not like butter on my bread, i politely explained that if she needed a special meal she could have ordered this when she booked here flight, to which she replied my customer service skills were crap as i didnt know what the passengers needs were