Immaculate screwball comedy by its greatest practitioners, in which Cary Grant polishes up at least three previous roles as an absent-minded chemist in search of a youth drug. The chaos starts when a mischievous monkey accidentally mixes the magic formula into the water cooler, whereupon Grant and wife Ginger Rogers take turns to regress into childhood. For Grant, that means sex, speed, a crew-cut, checked jacket and socks, while Rogers wants to dance the hoochie-coochie in their honeymoon hotel. Monroe is on hand as the typist who can't type, while the timing of the gags can put most Hollywood comedies, never mind TV sitcoms, to shame. The classic inverted-world comedy, where kids and animals bring sexual anarchy into the demure adult world, leaving all inhabitants much refreshed and highly amused. DMacp.