London: Hollywood hunk Bradley Cooper thinks that sequels should follow the same formula as the original movie in order to be successful.
The actor is pleased that `The Hangover Part II` follows the same formula as the first movie, which went on to be a worldwide hit, reported a website.
The 36-year-old actor is all 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.
He thinks it is more likely to be a hit because the plot is similar to that in the 2009 film, which saw the men trying to piece together the events of an evening celebrating the final single days of a friend in Las Vegas.
"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," he said.