I walked into my local Starbucks and ordered my usual chai tea. I gave the nice guy at the register a five for my total. He proceed to give me change, in one handful, for a ten dollar bill. I immediately, without thinking about it, gave him back the extra five and told him that I only gave him a five. He thanked me sincerely, and was very nice about my gesture. I don't think I would have done it any other way...

As Phillip said, "it's good to pay it forward"....