Mix the directing team which brought you Dumb and Dumber and There's Something About Mary with the actor from The Mask and Liar Liar and you've a fair idea what to expect from this film.

Let's use colour and size to raise a few laughs

It's basic toilet humour mixed with slapstick. And for all that it's funny, although you won't need any stitches to sew your split sides back together once the credits roll.

Jim Carrey plays Charlie Baileygates AND Hank Baileygates. You see, after his wife leaves him, mild mannered cop, Charlie is pushed over the edge and develops a split personality.

Cheesy grin time

Hank's aggressive and horny. After a well played build up in which Charlie is pushed around by everyone, including a young girl, it's a relief when Carrey pulls that familiar face in a multitude of directions to turn into Hank.

Retribution is his. But that's only the start.

The arrival of Irene Waters (Zellweger) only complicates matters. She's being chased by a collection of racketeers and dodgy cops. Charlie/Hank take to looking after her. Both personalities fall for her.

Is that you Charlie...or is it Hank?

Me, Myself and Irene is another great vehicle for Jim Carrey's talents, although there's a sense you've seen it all before.

However, there are few other comic actors who could probably get away with fighting yourself as well as he does.

Carrey does have some strong back up, especially his wisecracking triplet sons. But by the end of the film so many different characters have been introduced that you struggle to remember who is good and who's bad.

The film often misses completely. A scene with a cow is both unfunny and irrelevant. But there are lines to savour. Hank introduces himself to Irene with the line "Hank Evans...for little girls."

You can also play spot the cameo. Look out for tennis pinup Anna Kournikova.

On the whole, a film which'll keep you entertained without ever reaching top gear.