Ingrid Goes West
2017
Adventureland (film)
2009
The One I Love (film)
2014
Black Bear (film)
2020
The Big Sick
Seeking a Friend for the End of the World
2012
Your Sister's Sister
Emily the Criminal
2022
Ruby Sparks
Garden State (film)
2004
Stranger than Fiction (2006 film)
2006
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Some sources included in this module are from JustWatch.
A man (Mark Duplass) falls into bed with his best friend's (Emily Blunt) sister (Rosemarie DeWitt), leading to an unexpected love triangle when his friend arrives the next day. Wikipedia