This is a great kids attention grabber. They will insist on participating. I know because they are pounding on my door right now as I'm writing this. They are like invading zombies wanting more.
With Animoji on iPhone X, you can create and share custom animated characters in the Messages App that use your voice and mirror your facial expressions. Just select a cartoon character and talk. Your X will record your voice and integrate like magic all your facial expressions. It's addictive.
You are also able to share these min-vids via email, Facebook etc. This feature is available on the X via it's facial recognition tech.
Here's some example I made: