The Hangover (2009)

A Las Vegas-set comedy centered around three groomsmen who lose their about-to-be-wed buddy during their drunken misadventures, then must retrace their steps in order to find him. 

Phil: Tracy, it's Phil
Tracy: Phil, where the hell are you guys? I'm freaking out. 
Phil: Yeah, listen, uh... we fucked up. 
Tracy: What are you talking about? 
Phil: The bachelor party. The whole night. It's... Things got out of control and, uh... we lost Doug. 
Tracy: What? 
Phil: We can't find Doug.  
Tracy: What are you saying, Phil? We're getting married in *five hours*. 
Phil: Yeah... that's not gonna happen.