Australian comedian Adam Hills is supposed to have top billing in this act, but the sign language interpreter steals the show. Her name is Catherine King and she is a master of her craft. Her ability to translate with not only her hands, but her entire body permits her to imitate accents that Hills uses. King's physical accents are perfect, as you can see as she switches between Dutch, French, Australian and Yorkshire movements.
I gather that King is Hills's regular interpreter. In this video of a more recent show, he introduces her and teaches the audience how to interact with a deaf performer.
Content warning: NSFW language (oral and gestural) in both videos. The sign for "wanker" is exactly what you'd expect it to be.
-via Laughing Squid