How can I resist a thread like this?
I'm a huge horror movie fan (and no wisecracks about my weight, if you please).
So I've got to limit myself to five? Hmmm....that's tough. Of course, the first three are no-brainers.
1. The Haunting (1963): best damn horror movie evah! No blood, no decapitated heads, no slashers in the closet, but scary as hell. I've seen it probably 20 times and still love the hell out of it every time I see it.
2. Night of the Living Dead (1968): Oh hell yeah. Romero crafted a milestone in the history of the horror film here. Mixed in with the horror of hordes of flesh eating zombies, there's some dark humor, and the extreme tension of the folks holed up in the house. This is a superb example of what you can do on a shoestring budget. Great writing beats great special effects. Every. Damn. Time.
3. Halloween (1978): Simply one of the most well crafted horror movies I've ever seen. This is John Carpenter's masterpiece. So many camera shots are just....
perfect. Not to mention it's very, very scary. Freddy and Jason....meh. They can't come close to this.
...and after that it becomes a bit more problematic. So many good horror flicks to choose from (by the way, all of the suggestions above are worthwhile, although I'm not as great a fan of TCM as most folks are). Anyway, for numbers 4 and 5.
4. Psycho (1960): Hitchcock. Perkins. Words fail me. This movie is, quite simply, superb.
5. The Descent (2005): Lest you think I've got my head stuck in the past, great horror movies are still being made, and this is one of the best in recent years, IMNSHO. Six strong, capable women go spelunking, and it isn't long before they're lost in the dark, hurt, and desperate. And then things
really get bad. I guarantee you'll be pulling your fingernails out of the chair arms before you're finished with this one.