I was on a favourite site of mine pertaining to travel. Someone posted in a thread about 'interesting conversations' with seatmates about the young newly married couple who asked him if he had anything to do on the flight. This was before laptops, DVDs etc. He responded no, and the newly married wife handed him a stack of TY notes and the corresponding list of gifts and they all wrote Thank You's on the international flight.
Personally, I would be APPALLED if someone requested this of me. It was a guy and he found it quite humourous. My ehell phrase would have been 'I'm afraid that won't be possible'.