The absolute nicest thing happened to me last week at Starbucks.  I was in the drive through, having ordered my grande doubleshot on ice, and pulled up to the window to pay.  The cashier cheerfully told me it was my lucky day. I'm thinking, Hey, they accidentally made an extra drink and I get to keep it (because this sort of thing does happen to me sometimes, and it is pretty nice).

But no, turns out the lady in front of me had paid for my drink.  Just a random act of kindness, the Starbucks worker tells me.  How incredible is that?