I used to watch loads of horror flicks as a kid. With hands over my face, peering through my fingers. But I was more excited than scared. Can't really remember being terrified.
I saw Omen when I was around 9-10. It was delicious back then and that's the first movie I think when thinking about terrifying movies.
In this scene, the lightning striking several times is better than the final, imo.
In this scene, when she goes through the window.