David's mates are not exactly the type of guys you would take halfway around the world to meet your prospective in-laws.
But Tom, Graham and Luke eventually head to Australia for a party.
What makes matters worse is that Mia's father, Jim Ramme, is a senator with powerful friends - people he would be trying to impress during his daughter's wedding.
So David, whose nerves are building anyway, faces the additional dramas that seem to follow his "fun-loving" mates wherever they go.
Throw into the mix a prize ram, an angry, demented drug dealer, a stoned mother-in-law (Olivia Newton-John) and a lesbian sister-in-law (Rebel Wilson) and you have the ingredients for mayhem.