One morning in mid-December Hogwarts woke to find itself covered in several feet of snow. The lake froze solid and the Weasley twins were punished for bewitching several snowballs so that they followed Quirrell around, bouncing off the back of his turban.
Philosopher’s Stone, Chapter 12
Hey, remember that time Fred and George Weasley bewitched a bunch of snowballs to punch Voldemort repeatedly in the face?
(via braveremus)