Kristin Bell does her best Katy Perry impression when she fakes sexual interest in Russell Brand in this unlikely, sorta-kinda foursome moment. When Sarah (Bell) realizes her ex (Jason Segel) and his new girl (Mila Kunis) are only a thin wall away, she puts on an enthusiastic rendition of the point-of-no-return (despite what appears to be very blasé boning).
Aldous (Russell Brand), not impressed with her performance, says, "I've heard that women do fake orgasms, but I've never seen it... It really, deeply upset me." Well, that makes one of us.