A man found guilty of killing four people in Nebraska allegedly attempted to carve the number “666” into his forehead, but ended up botching the job. According to the Omaha World-Herald, 28-year-old Nikko Jenkins told Douglas County District Judge Peter Bataillon during a recent telephone hearing that he “self-mutilated” by trying to carve the symbolic number -- known as the “number of the beast” in the Biblical book of Revelation -- into his forehead.