Meet Charlie Baileygates (Carrey), a veteran of "the greatest law enforcement organisation in the land" (the Rhode Island police force).
Charlie is mild-mannered, hard working, always helpful, and a devoted, loving father to three sons.
Unfortunately, Charlie has Split Personality Disorder, and when he runs out of his medication...
Meet Hank Evans (Carrey), Charlie's ultra-aggressive alter ego. Hank has a dirty mouth, he drinks like a fish and has some filthy habits.
Charlie and Hank have nothing in common...with the exception of Irene Waters (Zellweger), a beautiful woman with whom they've both fallen in love.
With his job at risk, he's assigned to escort traffic violator Irene to the police in New York State.
On the road trip, he has to battle corrupt cops as well as trying to keep his alter-ego under control.
The Farrelly brothers extend the string of heartfelt, stomach-turning comedies that began with Kingpin and continued with Dumb and Dumber and the gross-out masterpiece, There's Something About Mary.