When I was a student I worked as a volunteer in a hospice serving drinks to the patients and their relatives. One morning I went into a room and met a young mother who was clearly 30-40 years younger than any of the other patients. She asked me if I would buy her some orange squash and as I was back in the next day I readily agreed.
That afternoon I went to my nearest supermarket and bought the best and most expensive bottle of orange squash. The following day I went back to the hospice and gave the bottle to the woman. She asked me to take the money from her purse and I explained that it was fine and was a gift. I then stupidly had an argument with this dying young woman about who should pay for the orange squash.