A weird old guy gets Michael Keaton into a gown and tells him to put his feet in the stirrups, in the only science fictional sequence from 1996's Multiplicity. Then the machines whir and a lumpy body starts to form, slowly solidifying into a perfect adult clone of Keaton, with all his memories. It's a weirdly disturbing sequence, reminiscent of the 1970s Body Snatchers. And then the movie careens downhill from there, as you can see in our second clip.
Keaton ends up making two copies of himself: a hard-assed construction worker version to handle work, and a prissy neat freak version to handle his domestic chores. The only rule, as he explains here, is that neither version can sleep with his wife. Of course, they both end up doing her. And so does the genetically damaged clone of a clone whom they create later. The only funny sequence in the movie is when the wife, played by Andi MacDowell, pours out her heart to the mentally challenged clone of the clone.
Sadly, Multiplicity isn't even the best comedy about cloning featuring Eugene Levy in a supporting role, which ought to be a fairly easy category to rise to the top of. That honor belongs to Repli-Kate, a far superior movie.