harry potter boy's solemnly swear glow in the dark black tee x-large harry potter harry potter went from the loneliest boy in the world to hogwarts legend in the course of the famous novels. today he is everyone's favorite boy wizard and loved by so many fans worldwide. this boys tee features the famous marauders map saying "i solemnly sear i am up to no good" in glow-in-the-dark print on a 100% cotton shirt. the tee is short sleeve.