The Muppet Christmas Carol. And no, it wasn't the Ghost of Christmas Future. It was...that freaking door knocker scene.
Yeah, I'm the kid who got scared by the Muppets.
And speaking of weirdly scary Christmas movies, has anyone scene Rudolph and Frosty's Christmas in July? Well...https://www.youtube.com/watch?v=OlfBz6kAJd8
There was that quicksand scene in The Jungle Book.https://www.youtube.com/watch?v=MiOUJGCC_ro
There was Rourke's death in Atlantis: The Lost Empire.https://www.youtube.com/watch?v=LTg1uJgQC10
I've never actually seen this movie, but this one scene in The Adventures of Pinocchio was enough to really mess with my head.https://www.youtube.com/watch?v=xG5nJlUxbKo
People keep bringing up The Neverending Story, but this is the part that spooked me as a kid:https://www.youtube.com/watch?v=I_vzG5nYk1I
I can't find a clip of it, but in that old Disney movie Secret Agent Cody Banks, the bad guy swallows an ice cube filled with nanomachines that proceed to eat him from the inside out. For a mostly lighthearted movie, that was a major tonal shift.