“When the boggart bursts out of this wardrobe, Neville, and sees you, it will assume the form of Professor Snape,” said Lupin. “And you will raise your wand — thus — and cry ‘Riddikulus’ — and concentrate hard on your grandmother’s clothes. If all goes well, Professor Boggart Snape will be forced into that vulture-topped hat, and that green dress, with that big red handbag.”
