Bruce Potter is having probably the best, and definitely the weirdest, day of his life.
Last night, a giant man broke into the house his uncle had been hiding his family in, bearing one of the letters his uncle had been hiding them from, to tell him that he was a wizard. And apparently he's also a famous wizard, because he (or more likely his parents) had killed (mostly killed?) an evil wizard when he was a baby. (And also they had serious money and relatedly some people are goblins.) And now he's buying magic school supplies so he can go to magic school and learn magic, because the universe is even bigger and cooler and more amazing than he had thought it was, and Dudley and his friends will be going to a different school where Bruce isn't, which is also really amazing, so if he can just get everyone to stop staring at the scar on his forehead and expecting him to be cooler than he really is, then things are going to be, well, maybe better but at a minimum differently awful.
Bruce enters Madam Malkin's Robes for All Occasions in a state of cautious optimism with a side of expecting the unexpected.