http://johntitor.com/

this is the site I've been meaning to post. The story is a guy started posting on a time travel web site saying that he came from the future to retrieve an old IBM computer. He makes predictions very exact ones and has pictures and blueprints for his time machine. He said he was going to leave one day and then has been heard from since. I can't tell the story very well just look at the website it's very interesting.