My memory for some reason dredged up an ancient science fiction story in which a child's toy would zap little metal objects like paper clips into the fourth dimension. Great, until they started leaking back into our three. When you walk through a speck of paper clip, you can do serious damage. I wondered if maybe the same phenomenon would happen in "Envy," causing, say, five years of dog poop to reappear all at once. Not a pretty picture.

The plot idea resembles that classic British comedy "The Man in the White Suit," with Alec Guinness, who invented a fabric that never gets dirty. Of course Guinness underplayed the comedy, a concept alien to Black and Stiller. Not that we want them to dial down; they're gifted comedians, and it's fun to watch Dingman gnashing while Vanderpark celebrates his untold riches.

Vanderpark doesn't lord it over his neighbor; he builds an enormous mansion, yes, but right across the street from his best buddy, because he doesn't want to leave the neighborhood. So that every time Dingman looks out the window, he has to witness Vanderpark's latest acquisition: ancient statuary, a proud white stallion, a merry-go-round, whatever.

Because Stiller and Black are in the movie, it contains laughs, and because Christopher Walken is in the movie, it contains more laughs. Walken is becoming Hollywood's version of a relief pitcher who comes on in the seventh and saves the game. He hasn't had a lead in over 10 years, but maybe that's because he's so welcome in supporting roles. You can sense the audience smiling when he appears onscreen.

Here he plays a stumblebum who calls himself J-Man, perhaps in homage to that immortal movie character Z-Man, perhaps not. After Dingman's life melts down, he turns to a saloon for consolation, and finds J-Man standing at the bar ready to provide advice and inspiration. J-Man's dialogue is Walkenized; he says strange things in strange oracular ways.

So the movie is funny, yes, but not really funny enough. The screenplay, by Steve Adams, reportedly with uncredited input by Larry David, is best at showing a friendship being destroyed by envy, but weak at exploiting the comic potential of the invention itself. It gets sidetracked into the story of how Dingman hits Vanderpark's white horse with a bow and arrow, and we are reminded of the dog set on fire in "There's Something About Mary." Dingman also hits J-Man with an arrow, although J-Man reacts to this development almost indifferently.

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