Parental Guidance and a security blanket are strongly suggested.
Jaws
Suddenly, the beach doesn't seem like such a fun place, huh?
Fun fact: There was no PG-13 rating when Jaws hit theaters in 1975. It wasn't until 1984 that the PG-13 rating came about, after the release of two more Spielberg films that were a little rough to handle (Indiana Jones and the Temple of Doom and Gremlins).
Universal Studios Home Entertainment
Willy Wonka and the Chocolate Factory
Oh, this is a candy factory where children are killed with little to no remorse? Cool. And Wonka likes to take people on LSD trips with terrifying larger-than-life bugs? Cool. Cool.
Poltergeist
Ghosts, in general, can be really terrifying. Especially in Poltergeist, where we see a man ripping his own face off, a killer clown doll, and a tree that tries to eat a boy.
Metro-Goldwyn-Mayer (MGM) / Via nerdist.com
Indiana Jones and the Temple of Doom
Harrison Ford is a handsome man, and this film is horrifyingly violent. In particular, the sacrifice scenes, where at one point a man's heart is ripped out while he's still alive. And if that wasn't enough, he's then burned alive.