I stopped to put $10 gas in my car on Christmas Eve last year, figuring finding gas on Christmas Day would be difficult.  As I went in to pre-pay the cashier offered me a $20 gas card from the guy standing next to the counter. I thought he was wanting me to buy the gas card from him or something. He said,  No,  I'm giving you a $20 gas card.  I said  WHY???   He laughed and said, because it's Christmas,  Merry Christmas!   I was almost speechless, tired from work and just not thinking but I did manage a "Thank You Very Much"  It made my day!