you are a 4th year at hogwarts, after a night of detention in the forbidden forest, you figure out a very rare type of creature, so rare no one has bothered to name them, attatched themselves to you, its basically just a black inky blob with eyes, and there's more than one, eo your arm is completely covered, you go to Hagrid for help getting them off

"Woag, yer one lucky fellow for getting them ta' like you"