Just so no one accuses me of stealing it... Yes, the line was from Harry Potter and the Sorcerer's Stone (Philosopher's Stone) and was stated by Severus Snape.
The article that started it all...
Okay, so let me get this straight. Stephen King, the most famous author walking the earth, most likely, walks into a bookshop and signs 7 copies of his book, which raise the value of the book immensely, and someone reports him for vandalism?
Now, granted...most authors ask the manager before signing books, but this is Stephen King. How does not one but several people mistake who he is?
Just when you think you're so famous, no one can possibly mistake who you are, something like this happens.