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
Crystal the Monkey in July 2011. She portrayed a drug dealing monkey in the 2011 film "The Hangover Part II". Director Todd Phillips raised concerns after he joked that Crystal had become addicted to cigarettes after learning to smoke them for the film. Philips later explained that Crystal never actually held a lit cigarette on the film's set, the smoke was added digitally in post-production, and the cigarette was ceramic. Still PETA protested Crystal's appearance in the film because the studio used exotic animals for entertainment purposes and because the film does not carry the American Humane Association's disclaimer that "no animals were