What turned me off of the idea of watching horror movies was the time that I, my little brother, and a neighborhood kid watched Poltergeist.
My older brother had a clown doll. We had walk-in closets.
Until we moved out of that house, that clown doll was literally in a locked box at the back of my brother's closet, because both he and I were absolutely SURE it was going to attack... and I had nightmares of being sucked into my own walk-in closet, so I used to keep a pile of dirty laundry on the floor in front of the closet door so it couldn't open without me moving the laundry out of the way.
Never really had a taste for horror movies after all of that...