The mailman had no cash, and 5-year-old Adam Houssami let him have a drink for free on a hot day. That little went a long way, and the mailman later paid for the drink and then some! 

This is one of those life lessons that's best learned while young. According to WNEM, young Adam was at work in the front yard, selling his drinks when the Dearborn mailman arrived with no money. The sweet little dude told him it was ok, gave him one on the house and thought nothing of it. About a week later, his mother Krista found a surprise in the mail. The mailman had sent 20 bucks and a hand written letter saying that "good things happen to good people like you". The Kool-Aid only cost $0.50 but the gesture was priceless.

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