I don't know why....

sometimes, i don't know why stuff happens. like today for example, i was walking down the street with my friends and this one guy just came up and pushed my friend violently and ran away. ive never seen this kid in my life, and neither has my friend so i was tripping out. soooo, i was just wondering if this has ever happened to anybody else. i dont know why, he did it, maybe he was psycho?

Maybe he took some PCP?