John Titor the time traveler

Couple friends and I were around early teens or so when we first heard of it in the recesses of the internet. English wasn't our first language, so it wasn't that easy to dig up the information (especially the techy and pseudoscientific terms used to embellish the lore). We read chat logs, scoured forums.

Eventually we waited for the first predictions to come to pass... and they didn't. If I recall, it was that the 2000 or 2004 olympics wouldn't happen or something.

Fun Trivia: The character John Titor in the anime Steins;Gate is indeed a reference to this urban legend. I had a double take when I first heard the name in japanese. It is kind of wild, if you think about it, that such a niche internet urban legend from the early 2000s had enough of an effect that some mangaka worked it into an anime a decade later