He began acting on television, guest-starring in "Boston Common" and joined "Saturday Night Live" as a writer but lasted only two weeks. Galifianakis has stated "I worked on "Saturday Night Live" for two weeks, and Britney Spears was the host one week when I was doing it. Wrote a sketch, Will Ferrell was going to play a bodyguard to her belly button, and we were going to shrink Will down to fit into a belly button. ...she just stared at me after I explained it to her. And then she finally goes 'Yeah that's funny.'" Galifianakis co-starred in the film "Out Cold", and had small roles in "Corky Romano", "Below", "Bubble Boy", "Heartbreakers", "Into the Wild", "Super High Me", "Little Fish Strange Pond" and "Largo".