It’s true, 12/12/2012 will only happen once. 12/12/1912 only happened once too. So did 12/12/1812. And tomorrow will be the only time 12/13/2012 ever happens. It’s a paradox–it’s special because it only happens once in history, but since every day has only happened once in history, every day is the same in that regard. Mind-bottling stuff, folks.