"What's that?" fifteen-year-old Lily Potter's mother asked, standing in the doorway to Lily's room.

"It's a diary," Lily answered. "A bunch of my friends have them, and they're really useful for writing down private thoughts and stuff. I've been writing in it for a couple of months now."

"Incendio."

The diary burst into flames on Lily's desk, and Lily shrieked as her mother kept her wand trained on the burning diary until the flames died down.

Lily was so shocked her mother had turned and left the room before Lily could figure out what to say.

Lily turned to the burnt diary, utterly confused. "What . . . ?"