When I grow up, I’m going to have my first kid read the Harry Potter series and convince him that he’s a wizard, too, and he’ll receive his Hogwarts letter when he turns eleven. Sure enough, on his eleventh birthday he’ll check the mail to find the letter (written by me, obviously) and in the fall, I’ll take him to King’s Cross, point him towards platforms nine and ten, and not say a word as he collides into the pillar.