Shy and timid Hung (Eric Tsang) is asked by his jailbird brother (Tsui Hark) to look after his mistress (Loletta Lee) and his unsuspecting wife (Margaret Lee). Chaos and many hilarious situations arise when Hung is caught between the two women.
Test pilot Tuck Pendleton volunteers to test a special vessel for a miniaturization experiment. Accidentally injected into a neurotic hypochondriac, Jack Putter, Tuck must convince Jack to find his ex-girlfriend, Lydia Maxwell, to help him extract Tuck and his ship and re-enlarge them before his oxygen runs out.
Expecting the usual tedium that accompanies a summer in the Catskills with her family, 17-year-old Frances "Baby" Houseman is surprised to find herself stepping into the shoes of a professional hoofer -- and unexpectedly falling in love.