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 II and the second-highest-grossing opening weekend of all time for an R-rated film, behind "The Matrix Reloaded" ($91.7 million). For the Memorial Day four-day weekend, the film amassed $103.4 million to become the fourth-highest-grossing Memorial Day weekend opening. In its second weekend the film gross dropped 64 percent from the previous weekend—while the original film dropped only 27 percent during its second weekend—and grossed $31.4 million. The film ended its box office run on September 15, 2011, on 113th day of its release. "The Hangover Part II" debuted in 40 countries internationally over the weekend of May 26–29, 2011, across 5,170