The Horror

 - an intense feeling of fear, shock, or disgust.
In movies, you see it in the form of ghosts, monsters, vampires, i.e. dark and evil.

Just to share, I came across this short story on internet -
A girl heard her mom yell her name from downstairs, so she got up and started to head down. 
As she got to the stairs, her mom pulled her into her room and said "I heard that, too." 
This gives a chill to your spine.

Horror is all fiction and funny till a non-fiction experience.
While, terror is the feeling of fear and is in anticipation of an horrifying experience. It is different from horror.
As the saying goes, you are terrified before marriage and horrified after marriage. You know. 

As kids, we feared to look under our bed as we assumed monsters and ghosts to be under our bed.
Now I realize it was just darkness.
But it is darkness only till you experience the below:
A dad begins tucking his child into bed and the child tells him, "Daddy, check for monsters under my bed." 
He looks underneath for the child's amusement and sees his child, under the bed, staring back at him quivering and whispering, "Daddy, there's somebody on my bed."