Me, Myself & Irene (2000)

Charlie is a Rhode Island state trooper with a multiple personalities. He is otherwise mild-mannered and non confrontational until somebody or something pushes him a little too far. That's when his maniacal alter-ego, Hank, takes over. Charlie is assigned on a routine mission to return alleged fugitive Irene back to upstate New York, but they wind up on the run from corrupt police officers. And their escape would be a lot simpler on everybody involved if Hank didn't keep stepping in at the most inopportune times….