Pocket Ants

So I was walking down the street when I see this guy chasing people around with his hands in his pockets. The whole time he is yelling, "POCKET ANTS" over and over again. I start to back away because I'm pretty freaked out. Then he saw me and ran after me still yelling "pocket ants." Finally, he catches me and takes his hands out of his pockets and threw ants all over my body. He then shouted, "You're it!" and left as I tried to get the ants off. What the fuck just happened?