Sigourney Weaver hosted last night's episode of Saturday Night Live, and a good friend of hers appeared with her in the evening's digital short: James Cameron.  The sketch has Cameron pitching a film to SNL producer Lorne Michaels that is equal parts Terminator, Aliens, Avatar, and bad.  The short's clever, and it proves Cameron knows how to make a little fun of himself and some of his bolder assertions (like telling anyone who'd listen that Avatar would be a film industry "game changer").  Watch the sketch for yourself after the jump.

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