Ah... the classic example... there it is, on December 31, in the birth dates...

1926 - Tom Marvolo Riddle, English wizard

Tom Marvolo Riddle is a fictional character in the Harry Potter series of books. But you'd never know that from the date page.

Update: The birthday was added as an event, moved to a "fictional events" section, and finally deleted. How many bets that it will be back within a few weeks?