When I was a kid, family movies were traumatic. It seemed movie-makers took macabre delight in cramming their films with grisly scenes guaranteed to leave lasting psychological damage on the young minds watching them.
Just a few examples; Return of the Jedi's gargantuan Rancor monster chomping down a guard in Jabba's palace, Dorothy learning the horrifying truth behind Princess Mombi's hall of disembodied heads in Return to Oz and Judge Doom's screams of pain as acid burned him away in Who Framed Roger Rabbit.
As an adult, it's hard to see where the horror lies, but as a wide-eyed impressionable kid each and every one of those scenes scared the bejezus out of me. These films always had happy endings, but boy, did directors make you sweat to get there.
I think it was Gremlins that was the scariest. It's also the one I loved the most.