I was watching one of the Futurama S4 Commentaries, it was the "Love and Rocket" episode (excellent commetary BTW) They started to talk about "Alien" and Billy West asked how did they make Jones scare when the Alien first dropped into the frame. They never were able to come up with it, though, I knew they brought in a German Shepard to intimidate the cat for that shot. I wish I could have yelled it out to them. Who else has experienced something like this with a commentary?