Gilligans Island?

Matango (1963)
Dir: Ishirô Honda
****

Seven people with varying backgrounds embark on a pleasure cruise only to be shipwrecked on a deserted island (Haven't we heard this somewhere before?). The allegiances quickly fall apart as there is barely any food to eat...except for these mushrooms that make you trip balls and turn you into horribly disfigured mushroom people! Haunting and truly creepy, the backbone of this story relies on the greediness and dissemination of character when forced to survive in a dire situation. In a simpler word, awesome!