What's wackier than a shot-for-shot remake of Psycho? How about an exact redo of the 1989 Tom Hanks slobbering dog-cop comedy Turner & Hooch? That's the premise of T&H2K: Behind the Scenes on the Shot-by-Shot Remake of Turner & Hooch, an eight-minute mockumentary by writer director Jim Frohna. The short, a response to Gus Van Sant's ersatz Hitchcock, includes a producer named Verne Drayner (think Brian Grazer) saying, ''We're not trying to make it better we're just trying to make it again''; a rented French mastiff as the oft-drooling Hooch; and ''two hot young actors from a fictional WB show'' in the roles once played by Hanks and Mare Winningham. Frohna plans to enter T&H2K in film festivals, but first he will send it around Hollywood to coincide with the Dec. 4 release of Psycho. ''I want to try and deaden Psycho's effect,'' says Frohna. ''I want people to laugh, but say, 'My God, what have they [the Psycho folks] done?'''