A man grows a cherry tree out of his skull and has to live with it. The entire movie is commitment to that one absurd premise, played completely straight. You're watching someone navigate the world with literal fruit growing from their face, and the film doesn't wink at you once, it just follows him through the consequences, the embarrassment, the slow realization that this is now his life. The humor lives in that gap between the impossible situation and the mundane problems it creates. It's the kind of thing that either destroys you laughing or doesn't land at all, depending on whether you're built for comedy that trusts the weird instead of explaining it.
A tight-fisted man eats some cherry seeds, and a cherry tree sprouts from the top of his head. The unlikely growth lands him in a great deal of trouble. The film is a fantasy comedy built on one absurd premise, following a miser who finds himself carrying a tree wherever he goes.