First of all, if possible avoid the dubbed version of this one (ATTACK OF THE MUSHROOM PEOPLE). The dubbing is no worse than usual for a Japanese sci-fi/horror movie, but this one really needs the subtitles so the viewer won't be distracted by the cartoonish dubbed voices. There is an excellent widescreen/subtitled edition of this available from Video Daikaiju ( if they're still in business; they somehow got away with putting out excellent-quality subtitled versions of the films that Toho released for the Japanese video market), and it is also pretty easy to find at various comics/sci-fi/media conventions.
MATANGO scores very high on the slow-burn creepiness meter, and the story of a bunch of hapless castaways slowly descending in to distrust and madness is utterly compelling. What they find on the island is truly disturbing, and I can't put into words how thankful I am for not having seen this during my formative years. This is one of those movies that can royally mess up your mind if you're a little kid. HIGHLY RECOMMENDED.
