Of all the films on this list, House is the one that you need to see immediately if you haven't seen it before — and actually, even if you have seen it, it's never the wrong time to watch it again. It's also the one that's probably the most well-known. A high-end Criterion Collection version was released in 2010, and it's become a cult favorite for fans of Japanese cinema and surreal horror flicks.
Also known by the Japanese pronunciation of Hausu to avoid confusion with the American horror flick of the same name, House tells the story of a group of schoolgirls, with each one named for their defining trait. There's Fantasy (who's always imagining things), Prof (the smart one), Mac (who's always eating), Melody (the musician), the kind-hearted Sweet, and Kung Fu (the tough one) who at one point gets into a fistfight with a severed head. The leader of the clique is Gorgeous, and when she gets angry at her father for coming home from his vacation with a new wife, she convinces the other girls to go for a vacation at her aunt's house in the country. The problem, as you might've gathered from the whole "severed head" thing, is that the aunt is actually a witch who absorbs the girls' youth by murdering them in increasingly bizarre ways. Sweet, for instance, is attacked by a possessed futon, and Melody is eaten, piece by piece, by a grand piano.
It's a strange film, but it comes by its strangeness honestly. Tasked with making a horror movie, director Nobuhiko Obayashi based the story on nightmares and fears of his 10-year-old daughter Chigumi, and intentionally avoided making the special effects look realistic in order to underline the dreamlike quality of a story that bounces between characters drowning in a house full of blood spat from the mouth of a demon cat, and a man turning into a pile of bananas for no particular reason. It's amazing, in every sense of the word.