Some people pull shit like that just to be spiteful bitches.

I used to play Magic: The Gathering. I had a deck that people had offered to buy off me for $200 before, but no deal. I was gonna play a game after the gym class. I locked it up in my locker, after gym, I go back, the cards are missing, I find them in a toilet, ripped up and pissed on. The teachers just told me I shouldn't have brought them to school.