I've been searching for years for a creepy song I once heard. It was from the Pandora Halloween playlist from 2013 or 14. I don't remember much but from what I recall the song started as an upbeat 60s or 70s song about going to the beach to hang with friends and suddenly the music would shift with the singer warning in a creepy voice something along the lines of "it's behind you" before continuing with the song about the beach. As the song reached it's close it broke down into nothing but the creepy warning repeated with more and more urgency as the music became more creepy until an abrupt end. I've searched for years and haven't any clue how to find this song. I have wanted to share it with friends as it is still the most genuinely disturbing song I've ever heard. Any help is appreciated, thank you.