Zacharius Knight "Zach" Galifianakis is an American stand-up comedian and actor, known for his numerous film and television appearances including his own Comedy Central Presents special. While initially more of an "underground" comedian, he has garnered mainstream attention for his role in the Todd Phillips-directed comedy film The Hangover... - www.wikipedia.org

Steven John "Steve" Carell is an American comedian, actor, voice artist, producer, writer, and director. Carell became famous for his roles in the television series The Daily Show with Jon Stewart and The Office. He has also starred in several Hollywood films including Anchorman, The 40-Year-Old Virgin, Little Miss Sunshine, Evan Almighty, Dan in Real Life, Get Smart, Date Night and Dinner for Schmucks; and voiced characters in the animated films Over the Hedge, Horton Hears a Who!..(Wikipedia)