When I was very young, I viewed Quentin Lawrence's "The Trollenberg Terror" and Irving Pichel's "The Most Dangerous Game" quite often on late night TV. In retrospect, they are very hokey, but at such an impressionable age, these two films scared my sister and me a great deal. In fact, I think they marked us for life.
"The Trollenberg Terror," more often referred to as "The Crawling Eye" -- I love that name -- is about two psychic sisters in a remote ski resort who are terrorized by a giant, tentacled eye which uses the fog to hide its movements. The film climaxes with a King Kong-like finale involving the United Nations and an aerial battle with phosphorous bombs.
What more could you ask for in a cinematic experience? :) ... Except perhaps some better special effects. :p