Directed by Bobby and Peter Farrelly, starring Matt Damon, Greg Kinnear, Eva Mendes, Seymour Cassel, Cher and Meryl Streep.

The Farrelly brothers are not known for their subtlety or love for the politically correct. In the past, they've played mental illness and obesity for laughs and pulled it off, due to snappy writing and a lot of heart throughout. In 'Stuck on You', they take a subject that borders on the taboo. But everyone, if they're being honest, wonders how adult Siamese twins carry out daily functions and sustain relationships and careers.

The film opens with the brothers flipping burgers at their Martha's Vineyard diner. As a double act, they've perfected the job to a tee; so much so that their customers are promised a free meal if they don't get their food within three minutes. However, the disadvantages of literally being joined at the hip soon become apparent. While the blonde-haired, twinkly-eyed Walt, (Kinnear) easily picks up women at the local bar, the shy Bob (Damon) has to contend with emailing his penpal in California from the other side of the bed. "Can you type on your back bro?" asks Walt, in the company of an energetic blonde.

While Bob is happy enough in snowy, small-town nowhereville, budding actor Walt has his sights set on the allusive lights of Hollywood. The pair make a truly endearing double act. Matt Damon, looking less pretty-boy and more average-bloke-on-the-bus with his new brown hair, has proven he can do odd ('The Talented Mr Ripley') and action ('The Bourne Identity'). Here he proves he can do human. His portrayal of the self-effacing Bob, who wears an all-over blue suit to make himself invisible on camera during his brother's stab at TV stardom, is a delight. Walt, despite his swagger and big talk, exudes charisma and genuine love for his sibling.

In 'Stuck on You', the Farrellys have created a sweet and touching film that doesn't sell its soul for the sake of cheap gags - it is hilarious in all the right places. Their new West Coast friend tells them they could get an operation to be separated: after all, anything is possible in Hollywood. Upon hearing that they're joined at the liver and a procedure would be too risky, she remarks: "Are you even sure you need a liver? My brother got his appendix out and he's ok."

While 'Stuck on You' concentrates on the relationship between the two, there is much fun to be had with the supporting cast. Seymour Cassel is hilarious as an old-style Hollywood agent, chomping on a cigar and zipping around on a motorised wheelchair. Cher plays herself, somewhat bravely, as a complete bitch while Meryl Streep is the object of star-struck Walt's affections.

It has a great soundtrack too: any film that opens with the Pixies' 'Here Comes Your Man' really can't go too far wrong.

Anne-Louise Foley