In my last post, I described why I think the scene after Duncan's murder is one of the most frightening in Macbeth. I forgot to mention one of its most frightening features, that Macbeth can never return to being what he was before the murder.
This made me think about a movie that scared the s—t out of me when I was a kid: the 1959 Walt Disney comedy The Shaggy Dog. I saw it in 1969 as part of a rerelease double feature with The Absent-Minded Professor.
That was far scarier than the fighting trees in The Wizard of Oz, though those were plenty scary.