Being silly with your child and imitating this part of the movie, is a wonderful way of introducing piano (soft), crescendo (growing louder), and forte (loud). Most kids have some level of understanding of loud and soft, but it is the crescendo--the growing louder-- that can be a challenge. It requires control and the grasping of this concept makes crescendo and decrescendo in music lessons much easier to understanding and perform.
Enjoy the movie and entertainment!
*Let me know if you try this tip and how it worked for you!