Robin Williams plays an inventor so scatterbrained he forgets to show up for his own wedding, but so inspired he invents Flubber, a form of pure, mischievous energy that can endow anything it touches with the gift of flight. As soon as Williams sets his goo loose on the world, mirthful chaos is inevitable.

Flubber, though, seems to have been coated with a substance of entirely opposite qualities. Every joke rises like a bag of wet sand; every flight of fancy seems weighted with a ballast of crap. The only real laugh comes when Williams kneels sobbing over the battered casing of his computerized companion, Weebo. Otherwise, this "comedy" is a sad, sad affair.