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

[serge gurkski]

when my daughter was about 6 or 7 (about 25 year ago) we'd gone down to london to watch a musical calls cats by A. L. Webber. we took both kids but this is about the youngest. we gave her 5 pounds (English currency) so she could get something for herself from the shops. ( five pound then was a lot of money) so...we were doing the shopping thing before hitting the theatre. as we passed a down and out in a doorway, (who was an obvious piss head wino) lyndzy started crying, when i asked her what was wrong, she said "i want to give that sick man my money but you said it was for clothes." i was fuming inside and wanted to explain that the tramp was some lazy bastard wino blah blah blah, but she was my daughter and i loved her and i knew it would somehow make her lose that kind of innocence all to quickly, so i said go on then give him. which she did. her face lit up but not as much as the wino's i gave her another fiver to spend and told her if she tried to give it away, i'd go back and take the money off the wino who got a windfall.

learned 2 new idioms/expressions a down and out (love the Orwell novel) and windfall. And 5 pounds (even if translated into €), dear sir, is still a lot of money to me. ;-) won't waste it on clothes of course.