There were a few things like that that frightened me, but I must say that emotional conflict between characters often got me more than the monsters (like the aforementioned Triton incident). As the Doctor (from Doctor Who) said, "I don't do domestics." I was a little freaked by the Cave of Wonders in Aladdin, and the transformation of the Queen into the hag in Snow White. But anything else is vague, though I have seen a lot of Disney movies both at the cinemas and on video when I was young and vulnerable.
This isn't completely Disney related, but I got freaked out by the Wolf theme in Peter and the Wolf. It actually once got to the point where I had a nightmare of a band playing the Wolf theme and a wolf pounced on me, ready to kill me.
Another time, when I first got into Doctor Who, I persuaded my mum to buy me a recently released story (that was missing from the BBC archives, but had just been found) called Tomb of the Cybermen. The end of the first episode involved someone being shot by a hidden laser, and he falls down, smoke pouring from him as if he was on fire. I was freaked out by this, and turned off the video, and never wanted to watch it. My brother (younger than me) watched the video later, and teased me. But I thought that the guy was going to look like a burnt mess. Later, I gave the video away to a friend of mine (a teacher who liked Doctor Who. I was only 10 at the time, but we were friends). Eventually, I came to watch it again, after I had seen things worse, and there was no gruseome make-up on the shot man. The story, while chilling, is a good one.
I also got freaked out by Unicron from the Transformers movie, especially a scene apparently showing a robot getting digested.
Here's the link to a 10-minute long video from the first episode of Tomb of the Cybermen. This includes the ending of this episode.
http://www.youtube.com/watch?v=BURCgSB_GdY (Sorry, no embedding allowed for this video.)
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(No longer a mod)
On sabbatical...