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The raunchy "Mike and Dave Need Wedding Dates" is the sort of scattershot, hit-and-miss comedy where somebody must have said, "We'll find the movie in editing" — and they're still looking for it.

Party-hearty brothers Mike (Andy Devine) and Dave (Zac Efron) are given an ultimatum by their sister Jeanie (Sugar Lyn Beard): Bring dates to her wedding in Hawaii so they don't ruin the event with their hijinks.

The guys post an ad on Craigslist, which goes viral and attracts hundreds of prospective dates, all seeking a free trip to Hawaii. Two of them are Alice (Anna Kendrick) and Tatiana (Aubrey Plaza), the female equivalents of Dave and Mike, who pretend to be demure, smart girls to snag the invites. They do, of course, and predictable craziness follows.

Some of the gags, like Kumail Nanjiani's turn as a massage therapist who gives Jeanie his special naked treatment, are gut-bustlingly funny. Others, such as anything involving the brothers' lesbian cousin (Alice Wetterland), fall flat.

Based on the inevitable closing-credits outtakes, director Jake Szymanski (a veteran of Funny or Die and "Saturday Night Live") apparently filmed every gag the writers and actors could think of and collated the results into a barely coherent but occasionally funny movie.

'Mike and Dave Need Wedding Dates'

Opens Friday, July 8, in theaters everywhere; rated R for crude sexual content, language throughout, drug use and some graphic nudity; 104 minutes.