Thirdly and finally, he said, I wish to make an ANNOUNCEMENT. He spoke this last word so loudly and suddenly that everyone sat up who still could. I regret to announce that - though, as I said, eleventy-one years is far too short a time to spend among you - this is the END. I am going. Iam leaving NOW. GOOD-BYE!
He stepped down and vanished. There was a blinding flash of light, and the guests all blinked. When they opened their eyes Bilbo was nowhere to be seen.

Book 1, Chapter 1 A Long-expected Party