The Brave Little Toaster movie scene when the air conditioner goes berserk. Also in this movie when the evil clown appears in a creepy dream sequence.
Alice Through the Looking Glass (1985)
Okay, so this isn't a Disney film (I don't think), but it was shown on the Disney Channel way back in the day. The one character most kids remember is that %$#*&% Jabberwocky! The scene where it pushes Humpty Dumpty & starts chasing Alice through the woods. Another scene when it jumps out through a mirror. Another scene when it pops out of a birthday present & starts attacking the characters.
Bambi scene when they first reach the meadow. It's quiet, foggy, and Bambi's mother tells him to stay low while she checks it out first. Even though nothing bad/scary happens, it was very eerie when she's observing the meadow. The music score is spooky, and you keep wondering what's going to happen.
Pinocchio scene when Lampwick sprouts ears & transforms into a donkey.
The wolf from Lambert the Sheepish Lion cartoon short.
Pee-Wee's Big Adventure Large Marge scene. Another non-Disney film, but certainly shown on Disney Channel quite often back in the glory days. I'm sure you all remember Large Marge the truck driver. I'm sure you all remember what happens to her face. Enough said.