London, May 9 (IANS) Actor Bradley Cooper feels that movie sequels should follow similar formats in order to achieve similar success like the original movie.

And the actor is pleased "The Hangover Part II" follows the same formula as the first movie.

"The sequel can't be, 'Let's make a movie that has a completely different story but it won't matter because people love seeing those guys together.' I don't believe that - when you look at sequels that don't work in comedy, it's when they abandon the formula. I was very happy that there was a structure - a ticking clock, a missing night," femalefirst.co.uk quoted Cooper as saying.

"I don't believe that - when you look at sequels that don't work in comedy, it's when they abandon the formula. I was very happy that there was a structure - a ticking clock, a missing night," he added.

Cooper is set to reprise his role as Phil Wenneck in the forthcoming sequel, which sees a group of friends head to Thailand for a bachelor party which gets out of hand.