Sisters may not be much of a movie, but it is a party. In fact, more than half the film takes place during a wild, unhinged blowout. The hosts of this party-pretending-to-be-a-movie are Tina Fey and Amy Poehler, Saturday Night Live veterans and occasional awards-show emcees. Screenwriter Paula Pell’s sitcom premise—Fey and Poehler play sisters coming together to spend one last weekend in the childhood home their parents have just sold—allows the duo to vamp their way through a series of increasingly chaotic and eminently R-rated situations.