What's your favourite horror movie?

I’m sure it’s been asked before. In fact, I know it has. I don’t even have to search to find out.

However, a remake is always nice, since tastes change, new victims people come and go, and anyways, just like Jason never dies, and how Michael shall always rise no matter how many times he gets pummeled, this question will never die!

You can only have one, even if you have many. Feel free to differentiate it from others you love, and say what makes yours stand out amongst the corpses. But please just have one. (Or I’ll slash your throat lol.)