JASON and JULIE (Adam Scott and Jennifer Westfeldt) are single thirty-something Manhattanites. They've been best friends since college, they live in the same building, trust each other implicitly and aren't remotely attracted to each other. As the film opens, they meet at a chic downtown restaurant for a dinner with their closest friends, two married couples: LESLIE and ALEX (Maya Rudolph and Chris O' Dowd), funny and frank -- and BEN and MISSY (Jon Hamm and Kristen Wiig), such a sexy pai