Synopsis
Two strangers, Jack and Joy, awaken together to discover they've gotten married following a night of debauchery in Sin City, and one of them has won a huge jackpot after playing the other's quarter. When a judge refuses to have the marriage annulled, the newlyweds devise ever-escalating schemes to undermine each other and get their hands on the money – only to find themselves falling in love amid the mutual backstabbing.
In the end, what happens in WHAT HAPPENS IN VEGAS may prove the biggest surprise of all.