I've recently been called in to see the teacher after my DS came out of class at the end of the day in floods of tears as he hadn't had a sticker like all his friends.
I asked the teacher if there was any particular reason so that I could explain to him.
She told me that him and another boy had been having a weeing contest in the toilets to see who could hit a spider that was trying to get away from them up the wall.
I didn't know whether to laugh or cry...