John Titor was a poster on Usenet many years ago, who claimed to be from the future. His story remains an enigma. You can read more about him on Wikipedia.
If you're so inclined, you can buy John Titor themed stuff from CafePress. It's the kind of inside joke that takes a special person to appreciate. What intrigues me about the story is that I learned programming on an IBM 5100 and was familiar with some of the material discussed. I think I read some of his articles when they first appeared.