What have I got in my pocket?" he said aloud. He was talking to himself, but Gollum thought it was a riddle, and he was frightfully upset. "Not fair! not fair!" he hissed. "It isn't fair, my precious, is it, to ask us what it's got in it's nassty little pocketsess?

The Hobbit: Or, There and Back Again (ed. Houghton Mifflin Harcourt, 1966)