Cooper and Helms got huge career boosts from "The Hangover" and even Justin Bartha, who was off-screen most of the time, won a lead in the new Todd Solondz film, "Dark Horse." But, for my money, no one has done better, artistically or commercially, than Zach Galifianakis. I think he gave his breakthrough performance in a movie hardly anyone has seen: "It's Kind of a Funny Story," a coming-of-age story set in a psychiatric ward. Galifianakis brought off the role of a quirky surrogate parent to a possibly suicidal adolescent with humor, warmth, and nary a hint of sentimentality or condescension. He's the rare comic actor and comedian whose humanity and originality go hand in hand -- as you can see in this irresistible video of him interviewing under-age personal assistants. It was last Saturday's "SNL Digital Short."