Psycho was not a Horror flick, although you might have been horrified with it. I think in national survey, Exorcist came out at the top. For me it was Evil Dead as I remember every scary part in it when I watched it as a kid. Hindi horror movies also used to scare the crap out of me. Later when I grew up (and I am still a kiddo), they became funny, with all white floor on their face and walking like their joints cannot bend (really, do they loose flexibility in their joints when they die?). Even MJ's thriller was scary back then. I heard Darna Jaroori Hai, by Ram Gopal Verma has like 25 stars and 6-7 stories that are interrelated and scary. Watch Murde ki Jaan khatre mein. Now that's scary, ;)