code breaker

Yesterday Daddy had to stay home from work to keep William. William had gotten sick the night before a couple of times, so he had to go to the doctor. He has a throat infection. While Daddy was nursing William to health, they watched some movies from our collection. This morning, Daddy asked Mommy if d-i-n-o-s-a-u-r m-o-v-i-e was in the car because they couldn't find it yesterday. William immediately said, "dinosaur movie!" Now how did he figure that out?