Now this is horror movie material. What makes this tragic unsolved mystery even more terrifying is the fact this guy is still out there... if he hasn't died already. Only known as "The Doodler", or the "Black Doodler" ; this unidentified serial killer murdered 14 men in San Francisco between January 1974 and September 1975. We know what you're thinking: there's a tonne of serial killers out there, what makes this one so creepy? His trademark behaviour, before he killed, was to sketch his victims first; all gay men and drag queens that he picked up in bars and sex clubs. Unbeknown to the men, who thought they'd found a rather alluring artist, he then had sex with them before stabbing them to death. Three of his surviving victims were unwilling to go public, which means he has never been caught. He's not the only serial killer that's still roaming the streets right now: Pedro Lopez, who slayed over 300 girls and Issei Sagawa, who shot a student and ate her body, are both living "normal" lives outside of jail. That's us sleeping with one eye open from now on.