Did Dan Aykroyd get his role in Loose Cannons because Robin Williams wasn't available? In this dunderheaded buddy movie from director Bob Clark (Porky's), Aykroyd does a kind of prosaic, slow-motion version of Robin the mental quick-change artist. Playing a cop with multiple personalities, he starts out as the usual Aykroyd straight man: prim, precise, a techno-nerd in a bow tie. Then, he shifts gears and launches into rapid-fire impressions of pop-culture icons (the Cowardly Lion, Dirty Harry, Captain Kirk).
If only his fire were a bit more rapid. Aykroyd is a serviceable impressionist, but someone made a very grave mistake in thinking his little act was an entire movie. After a while, it's like watching a guy dance arouud with a lampshade on his head. The film's one bona fide guffaw it's not intentional comes when Aykroyd's partner, Gene Hackman, tries to ease the madness in his buddy's brain by quoting (with a perfectly straight face) Dylan Thomas' ''Do Not Go Gentle Into That Good Night.'' Next up for director Clark: Porky's IV: Madame Bovary's Revenge. F