It's not much of a secret but once I was on work experience in a school and the day before this kid landed flat on his face. He came in with a massive bruise on his head and he came up to ask me for assistance. Suddenly the voice that tells you to push someone off of a bridge told me to poke it. So I listened. It felt like rotten tomato and he busts into silent tears. Still, never got caught, but the child probably has brain damage, cos I didn't feel any skull.