Movies the disturbed you as a kid

I watched this as an adult and was drawn into a generally interesting plot and well voiced characters. However, it did remind me a lot of the movies that used to freak me out as a kid. I dont mean scare a little bit, I mean the stuff that really shook you. For me, there were quite a few cartoons that generally disturbed me deeply;
Animal farm. It wasnt the evil pigs or the death, for me it was the revolutionary song that the animals sing. Couldnt get it out of my head for weeks as a 10 year old.
Watership Down. Mainly Bigwig getting strangled and the rabbits suffocating in the warren. Oh, and the tearing out of bunny necks.
Lady and the Tramp. For sure the rats glowing red eyes, which was stupid because I've kept rats and gerbils as pets most of my life. Kudos to anyone who spotted the referance in the Rattatouille film. Also, the scotty dog howling at the end. Weird, but that did really freak me out.
The Mad Scientist. This was a Micky mouse cartoon that I only ever saw snippets of, but by christ it freaked me out.
And of course, Felidae. The scene with the piles of cat corpses. Dead cats on puppet strings. Yikes. And in general the scenes in the labratory.
Animal experimentation in general really shook me up as a child, particularly the glimpses in The Secret of Nymh and its sequel.
Plague Dogs. Generally a depressing movie. I watched as an adult out of curiosity, even though I knew it would probably freak me out. I though, hey I can take it. Im all grown up now. I was very wrong. Couldnt get this out of my head for weeks.