John (Wilson) and Jeremy (Vaughn) are two close friends and descreyentes divorce mediators in marriage - under the leadership of Jeremy, the two have become adept at the art of slip to a wedding (an art with a complete set of rules, who spout on several occasions, and a host of personalities false) The first 30 minutes show these two cheeky in a series of weddings, boasting of the most vile to get into a wedding (and the panties of assistants). From the fake war medals carry up to dance with young children or wet your eyes during the ceremony to appear sensible - the end justifies the means. And that end is a busy night with a lady available. Of course, eventually one has to fall in love (at first sight, no less - whereas the recipient of care is the amazing Rachel McAdams cliché becomes more bearable). And the rest of the film takes place in the efforts to sustain the lies that were presented to sneak into the wedding first of all, and efforts to recover road once the facade is exposed.