Devastated Peter takes a Hawaiian vacation in order to deal with the recent break-up with his TV star girlfriend, Sarah.
John Beckwith (Owen Wilson) and Jeremy Grey (Vince Vaughn) are divorce mediators in Washington D.The two friends frequently "crash" wedding parties to meet and bed women, working from a set of rules taught to them by a retired crasher, Chazz Reinhold(an uncredited Will Ferrell).At dinner later that evening, Gloria gives Jeremy a hand job under the dinner table, while John spikes Sack's wine with eye-drops (as a form of revenge for his earlier behavior).Sack becomes sick, which lets John further connect with Claire, and they agree to go for a walk following dinner.Once inside, the pair set their sights on Cleary's other daughters, Gloria (Isla Fisher) and Claire (Rachel Mc Adams).
Jeremy ends up having sex with Gloria on a nearby beach while the reception is taking place.Their goals are to enjoy the free food and drinks and ultimately to charm their way into bed with women from the wedding for a one-night stand.Gloria tends to him, while trying to engage him in sexual intercourse at the same time.I mean, I had an imaginary friend when I was kid, and his name was Shiloh! Sack Lodge: You know, you can just cut that psycho babble bullshit your mom tells you ok? We used to play checkers with each other every day, and bless his heart, Shiloh would always let me win! Three buddies wake up from a bachelor party in Las Vegas, with no memory of the previous night and the bachelor missing.