There is always that one extra thing in your pocket that you can't remember how it got there. That is a zezlo. It's a minor but nasty little spirit that pretends to be a bit of this or that or knick nack. It likes to stay close to people to steal stray words. The best way to get rid of a zezlo is to turn out all your pockets and empty your wallet or purse. The last thing found should be thrown away immediately with the phrase, "Špatná věc, vraťte se do tmy a obtěžovat nikoho znovu."
This was something you needed to know.