This is supposed to be an "outtake" from the movie What Happens in Vegas, which comes out next weekend is climbing the online video charts today.
It looks as if the footage is "leaked" or "stolen" by leaving timecodes windows on the footage but it seems to me that there has been some editing done and sound FX added to the footage.
My guess is that the movie studio marketing team has tried to make it appear this way in order to have the video go viral.
It will be interesting to see how well this clip does as getting people's butts into the theater seats.
About the movie:
Two strangers (Cameron Diaz and Aston Kutcher) 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. 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.