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Members of the Knocked Up/Superbad crew reunite for another irreverent comedy in the comely shape of Forgetting Sarah Marshall. Jason Segel is likeable as leading man/loser Peter, who's dumped by his gorgeous girlfriend Ms Marshall (Kristen Bell) in the opening scene. An initially agonising holiday ensues - she's there with her new guy (Russell Brand) - but life gradually looks up in this amiable and witty laughfest that only suffers slightly for its rambling moments.

This succeeds in creating sympathy for its hero from the off. Peter is stark naked when his girlfriend finishes with him - and then he's the object of ridicule when she spots him while holidaying with her rock star boyfriend Aldous. Russell Brand is, for once, well cast in the role of vague, vain singer Aldous, who's also the object of obsession for a waiter and aspiring musician in the Hawaiian resort. That this waiter is played by Superbad chubster Jonah Hill only makes the whole thing funnier.

"HEAVY SOBBING FITS CAN'T FAIL TO ENTERTAIN"

There are downsides. Mila Kunis may be noticeably prettier than Meg, the character she voices on Family Guy, but she feels too much like a token love interest - how many model girlfriends can one loser score, after all? Still, if Peter's imperfections are exaggerated, it's to amusing effect: his frequent heavy sobbing fits can't fail to entertain. And that's one of the genius touches of this comedy. It's prepared to expose the vulnerabilities of its hero and humiliate him completely - to the point where you've just got to love him and laugh at him in equal measure.

Forgetting Sarah Marshall is out in the UK on 25th April 2008.