After going on a walkabout into Oscarland with The Truman Show and Man on the Moon, Jim Carrey is back at his frenzied near-best in Me, Myself & Irene, the latest gross-me-out from the Farrelly brothers. He plays a Rhode Island trooper with a split personality: One is a Milquetoast, the other insanely bullying, his voice a Dirty Harry rasp. There’s nothing here as blissfully satisfying as the best bad-taste parts in Dumb and Dumber or There’s Something About Mary, but Carrey is a phenomenal whirling dervish of a performer who could probably have added another four or five personalities to the mix without breaking a sweat. If he and Eddie Murphy, another performer who likes to split himself up, ever decide to make a movie together, the blur of guises will induce mass vertigo in the audience.