Bradley Cooper has revealed that it was Ed Helms' reaction and not the naked scene itself that was entertaining in The Hangover - Part II.
Cooper is back as Phil in the sequel to the 2009 comedy - which also sees Ed Helms, Justin Bartha and Zach Galifianakis return to their roles as Stu, Doug and Alan.
Speaking to Entertainment Tonight the actor said: "I was more shocked by watching Ed's reaction to it all and how amazing it was. Just watching Stu having to find out what went down."
And while there may have been some crazy antics going on on screen Cooper admits that none of that continued when the cameras stopped rolling.
He confessed: "Much like the first one, all the craziness you see is in the film. There's not much you could try to outdo once the shooting day is over.
"My favourite thing to do was putting my headphones on and walking round the city."
Cooper has already topped the box office this year with his last movie Limitless, which saw him team up with Robert De Niro.
The Hangover - Part II is released 26th May
Tagged in Bradley Cooper Ed Helms