The Hangover Part II takes no chances and opts for a safe, subdued pre-wedding brunch. Things do not go as planned, resulting in another bad hangover with no memories of the previous night. Development began in April 2009, two months before "The Hangover" was released. The principal actors were cast in March 2010 to reprise their roles from the first film. Production began in October 2010, in Ontario, California, before moving on location in Thailand. The film was released on May 26, 2011 and became the highest-grossing R-rated comedy during its theatrical run. A third and final installment, "The Hangover Part III", was released
The Hangover Part III new idea. As far as where it takes place, I said I'm very open." Also during May, Craig Mazin, who co-wrote "The Hangover Part II", entered early talks to write the script for the third installment. In December 2011, Bradley Cooper appeared on "The Graham Norton Show" to promote "The Hangover Part II" DVD and Blu-ray release, where he stated he "hopes" that "The Hangover Part III" will start shooting in September 2012, and also stated that Todd Phillips is working on the script. In January 2012, it was reported that stars Bradley Cooper, Zach Galifianakis, and Ed Helms were