A perfect example of that old rule “tell your friend you have feelings for him, because he may get drunk and sleep with your sister.” Iris (Emily Blunt) invites her friend Jack (Mark Duplass) to stay at her family’s vacation house, but when Jack finds Iris’ sister Hannah (Rosemarie DeWitt) is also there, a night of drinking and sex leads to some awkward conversations. Especially when Iris shows up.