Russian researchers kept five people awake for fifteen days back in the 1940's as part of an experiment. They were kept in isolation from the researchers, who listened to them via microphone. Everything was fine for the first five days, aside from their conversations taking a darker turn. Then after nine days, they started going crazy and screaming, and a couple of them smeared their feces on paper and covered the windows. After twelve days, this story starts getting really ridiculous and unbelievable, because it is fiction.
For whatever reason, this story made it beyond the creepy pasta stages and started popping up on paranormal websites. While I get that these sites ten to post claims and nothing else, anyone who took the time to read at least the first half of the story should have detected that it was less believable the further it went on, and even a simple internet search would yield no credible sources, aside from ones saying it is fiction. What the hell, man?