Ruining Sarah's Day - Forgetting Sarah Marshall (2008) - TM & © #UniversalPictures Peter (Jason Segel) stalks Sarah (Kristen Bell) and her boyfriend (Russell Brand) back to their room, over loud protests from Brian (Bill Hader). Click the link in bio to watch the full movie. #forgettingsarahmarshall #jasonsegel #milakunis #billhader #kristenbell #russellbrand #2000smovie #movieclips