That's weird , me too!!!
Informative XD
What was yours?
...and how old were you when you saw it?
When I say true horror I mean steering away from creepy kids movies or tv series designed to scare kids / young teens a bit, I mean more adult style serious horror movies. Nightmare on Elm Street, Halloween, etc.
For me, my first true horror movie was the colour version of Clive Barker's 'The Thing' which I watched at the tender age of 7, and it scared the living crap out of me XD
The Thing was also my 1st true horror movie. Though I was 15 when I saw it. Freaked me out as well. It was doubled billed with Poltergeist. What a night that was!