We used to have a group of guys go past our place on a Saturday & sunday night a while ago who we called 'the heavy mob'!
One night they stopped outside on the bypass so I went out to see what was wrong, seems one had run out of fuel so I went & fetched a part gallon can I had in the shed & gave it to the guy to get him going.
He gratefully took the fuel & offered me a £5- note to which I said 'hell no just help someone else who's broken down one day mate' & took my can back. The guys all shouted back 'good on yer mate' & set off with a hell of a racket(open pipes save lives lol) to the petrol station a mile or so further down the bypass.
The next night they went past they all sounded there horns etc so I knew they'd remembered my help & to this day a couple of them still wave or sound there horns. It's nice to be nice really & don't cost much does it?