“The oldest and strongest emotion of mankind is fear, and the oldest and strongest kind of fear is fear of the unknown.”
--H.P. Lovecraft
Horror stories, it has been contended, were likely the first types of tales created and told by humans. For primitive, cave-dwelling bands isolated in an unknowable, hostile world not of their making, surrounded daily by pain and terror and death, recounting ghastly events--both real and elaborately imagined--served to process their harsh surroundings in a way that not only entertained, but educated.
Do not venture into the valley over the next ridge, one aged Neanderthal says to the disbelieving youths of his tribe. If you do, you shall never return.