John Titor
So, in the late 90's I went to a goth convention in New Orleans, where my wife met a time traveller named "Butterfly".  I saw her talking to a weird looking guy, and swung by to see if she needed help, but she had that "oh this is going to be a great story" look on her face and kind of shooed me away.  Later, she told me he had claimed to be from the future.  He made some predictions:- there would be a war in Iraq, but it was not actually as big as the one that happened later- after the Big War, there was a disease that forced everyone to live belowground- he had a computer chip in his hand- he had a son in the future named GandalfThis all seemed pretty wacky, if harmless.  My wife enjoyed relating it all in our Yahoo Groups email group.  Then, in the next few years:- the implanting of computer chips in pets became commonplace- we started hearing about new viruses every few years- we went to war in Iraq- Lord of the Rings movies came out, which made it more likely someone would name their son "Gandalf"So, I asked my wife, "what else did that guy say would happen?"She said, "I don't remember it all now, but I put a really detailed list in my email to the Yahoo Group."So, we look in the Yahoo Groups history, and...that month was missing from the history.Oh, well.  If he had said anything more significant than a global pandemic and WW3, I assume I would have remembered it.