Hearing voices....

Christmas Eve, Steven was trying to get some holiday ambience going, so he flipped the TV on and found It's a Wonderful Life playing. He left that on, without turning on the stereo receiver, thus rendering the movie a silent one, and proceeded to turn on a Christmas CD instead. So after a while, we walked into the living room to find Kyra firmly planted in front of the TV, watching the movie in silent mode. We chuckled at this, and proceeded to go about our business of getting ready for the following day. About 20 minutes later, my sister went back into the living room and sat down next to Kyra, who was still watching the movie with no sound. Kyra turned to her with a confused look and asked, Why don't they have any voices?