By Adam B. Vary
July 25, 2012 at 11:40 PM EDT

As the sci-fi comedy The Watch nears its opening weekend this Friday, director Akiva Schaffer (Hot Rod) has released what he calls “an outtake reel” of NSFW moments and ad-libs from the film. Given star Vince Vaughn’s renown proclivity for improvisation, it inevitably includes an observation about costar Ben Stiller’s posterior that makes one wonder how Vaughn could know about the thing he claims to know about. Check out the trailer below: 

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