Penis on random spots???

I found this on Give Me Hope - a collection of inspirational stories. Only that I didn't get this at all. Why would a boy put penis at random spot?

"Today, I saw a little kid putting pennies in random spots on the hallway floor of the school I work at. I asked him why he was doing that, and he said he was putting the pennies heads up so that other kids would find them and have good luck today. Kids like him Give Me Hope."

And then I realise, ooohhhhhh pennies! The coins! FML