Sigourney talks about the Avatar premiere, Arnold Schwarzenegger sitting in front of Jimmy during the movie, the amazing visual effects and motion capture technology, working with perfectionist James Cameron on this film and on Aliens, preparing to play a fourteen-year-old in the movie, and getting in trouble a lot as a kid because she was the tallest. Watch Jimmy Kimmel Live! WEEKNIGHTS 11:35/10:35c on ABC. Stream on Hulu.