The Omen is one of my favorite creepy movies. I didn't see the first original one, however. I saw the last two which were quite creepy and disturbing.
The jist of the storyline I remember is that a kid is born to be the Anti-Christ and his parents don't believe it but then people start dying everywhere. Basically, everyone who tries to get in his way is destroyed and killed in some horrific fashions(one involved being squished between two train cars). In the original last one (I believe) he grows up and becomes incredibly influenitial in the government. He uses sublinimal messages when the Christ figure is supposedly born to rid the world of baby boys at that time. There's a very disturbing scene with that that was very creepy (and I hope they do something with that in this new movie if we get that far).
I want to see it sometime just to compare it to the old one. Hopefully, it will be just as creepy as the original.