The Hitchhiker (SCP-1337)

SCP-1337 (formerly known as Iris Thompson) is a Humanoid Apparition, free roaming, corporeal, and actively aggressive. It appears to be the wraith of Mary Talish, who resided just outside of Muncie, Indiana. Starting 19 months after her disappearance, SCP-1337 began to haunt on the 19th of every month, walking down Mayflower Road, attempting to flag down any passing vehicle. (imdb)