I have always been a fan of time travel stories but this is the first time I've heard about John Titor. Maybe I was still too young back then and was contented with ghost stories from websites with dark background and red colored fonts.
According to Wikipedia, in 2000 and 2001, this guy made a lot of posts on different message boards. He said that he was from the year 2036. He said that he was a military time traveler. He told people many things that would happen before 2036. Apparently he was wrong many time. It's surprising that he got so much attention. At one point a private investigator even looked into him. He declared that it was all a hoax. Well, maybe it was true and he just had a bad memory. That could be why his predictions didn't work out. Maybe he just went back to 2036. I guess in just 18 years we'll see. 