If you were playing in a football match and one of the girls on the other team was a really dirty player who kept pulling your hair, punching you in the back, and pushing you over - all out of sight of the referee - how exactly do you think you'd deal with the situation??
If there was a fancy dress store, like no other, where on Halloween, for one night only, you were magically transformed into whatever you were dressed as, what costume would you buy/hire from that store??