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 midnight opening for an R-rated film, replacing "Paranormal Activity" (2007) with $6.3 million. The film opened in a further 1,015 theaters during the launch day for a total of 3,615—becoming the widest opening ever for an R-rated film—and earned a further $21.2 million to accrue a launch-day total of $31.6 million; nearly doubling "The Hangover"s Friday launch opening ($16.7 million). This amount broke two further records; the highest-grossing opening day for a live-action comedy and the highest-grossing opening day for an R-rated comedy film, replacing "Sex and the City" (2008) with $26.7 million. According to exit polling, the launch day