“Ron, Hermione, Fred, George, Fleur, and Mundungus drank. All of them gasped and grimaced as the potion hit their throats: At once, their features began to bubble and distort like hot wax. Hermione and Mundungus were shooting upward; Ron, Fred, and George were shrinking; their hair was darkening, Hermione’s and Fleur’s appearing to shoot backward into their skulls.”
―
J.K. Rowling,
Harry Potter and the Deathly Hallows