What is the nicest thing you've ever done for someone without their knowledge?

[serge gurkski]

It was in January 1997. My father (adoptive father) was just recovering from heart surgery. He lived on machinery. He looked like a baby; he was not really back to life but for once I could pay him back all the fine things he had given me. He was half-awake and he was so thirsty and I let him drink.

I'm quite sure he does not remember this but I do.