Over at the Slytherin table, Malfoy, Crabbe, and Goyle were laughing at him, tapping their heads with their fingers, pulling grotesquely mad faces, and waggling their tongues like snakes.
It waggled its long ears, making up its tiny mind, then slouched slowly into the room. " The key's in the lock, " Harry muttered. " We could lock it in."
He thinks this is all some game. Jon wanted to shake some sense into him. " Waggle your ears all you like. It's your tongue waggling that makes the trouble" .