All because the little boy gave him some free Kool-Aid the week before.

Adam Houssami is a 5-year-old entrepreneur - he set up his own Kool-Aid stand in his Dearborn neighborhood. When the mailman arrived at his house for his daily route, he said that he was thirst (it's July in Michigan, after all), but that he didn't have any money. Adam gave him some Kool-Aid anyways.

Neither Adam nor his mom thought anything of it, until a letter came in the mail the next week...with $20. And a note that said the following:

"Adam - Remember last week you were selling Kool-Aid on a hot day? I didn't have any money but you offered me Kool-Aid anyways. Thanks man! I was really thirsty. Good things happen to people like you. Stay cool dude - Mailman."

Isn't that sweet?!?!?! And of course, he knew where to send the letter.