as to the john titor thing... well, I'm pretty skeptical of any person claiming to be a time traveler... tho, there was one guy a few years ago I remember reading about... he opened a trading account with $800 and in 2 weeks had made over $300 million or something and had never had a single losing trade... the FBI arrested him and charged him with insider trading... the guy said he was from the future... and based on the fact that his trades involved a number of completely different companies, I'd say it would have been nearly impossible for him to be doing insider trading... wish I could find the articles on that guy, last I heard he was rotting in jail...
lol, I just did a search... should have known it was fake...
Urban Legends Reference Pages: Time Travel Insider Trading
it did make yahoo news and a couple of other mainstream sources at the time... kinda funny now that I think about it...