The earliest memory of a movie/TV programme scaring me nearly to death in my childhood is from around '79/'80.
There was some strange 3 (?) part series running in the childrens' (!!!) programme in Germany, from which I only remember as much as a nuclear plant about to explode. The sounds of the alarm signals and sight of smoke and explosions simply drove me nuts!
The other bit is from '81/'82- I think, as my parents were watching a film(?)/TV series(?) set in the middle ages, with people fleeing from the "black death". The scenes I saw were spooky enough, but laying in my bed and still hearing the sounds from the living room didn't do my sleep any good either.
Watching the first 15 mins of "Jaws" on TV around '81, as I was about to learn swimming, wasn't probably the smartest idea too....