Dave welcomes actor Zach Galifianakis, former U.S. Army Sgt. Valerie Brown, and musical guest Allen Stone. Dave has some fun with the "Late Show" Hose Cam at the expense movie superstar Zach Galifianakis ("The Campaign"). Awkward! See what happens when "The Campaign" star Zach Galifianakis shows up wearing the same suit as TV's Paul Shaffer. Zach Galifianakis tells how he got co-star Will Ferrell to moon a group of fans. Dave welcomes former Army Sgt. Valerie Brown to discuss her military service and ongoing job search. (thetvdb.com)