Zach Galifianakis and Jimmy Fallon Try Acting with Prosthetic Arms 10.62K Whitney Jefferson 11/04/10 08:20AM Filed to: Late Night Late Night zach galifianakis Jimmy Fallon Jacob's patience TV Video tweet While filming a bit, Zach Galifianakis demanded that he (and the rest of the actors) use mannequin arms instead of their real arms. Filmed in a pool hall, logistics didn't work out quite as planned.