'The Skeleton Twins'
It takes a while to get used to the idea of SNL vets Kristin Wiig and Bill Hader as suicidal siblings in Craig Johnson's drama, but they wield their late-night chemistry with sobering strength. (Johnson shared the Sundance screenplay award with co-writer Mark Heyman.) Then, as soon as you're settled down, they slap on the nitrous masks and improvise a hysterical dentist's office bit, complete with fart gags. A few scenes later, they're singing a showstopping rendition of Starship's pop ballad "Nothing's Gonna Stop Us Now." We knew Wiig had range, but Hader too? Nothing's gonna stop them now. —L.H.