From gentle to mental

Charlie Baileygates (Jim Carrey) is a 17-year veteran of the Rhode Island police force. He is mild-mannered, hard-working, always helpful, and a devoted and loving father to three sons. Unfortunately, Charlie has Split Personality Disorder, and when he runs out of his medication...Hank, Charlie's hyper-aggressive alter ego appears.
Hank's got a filthy mouth, drinks like a fish, and enjoys a good fight.
Charlie and Hank have nothing in common with the exception of Irene Waters (Rene Zellweger), a beautiful woman on the run, with whom they both have fallen in love.
Now Hank and Charlie must wage war with each other for Irene's affections.