Most people know to sing "Happy Birthday" or the alphabet song to time out their hand-washing, but in Dwayne "The Rock" Johnson's house, they sing "Moana" songs.

Most people know to sing "Happy Birthday" to time out their hand-washing, but in Dwayne Johnson's house, they sing "Moana" songs.

Dwayne "The Rock" Johnson rapped a song from "Moana" while teaching daughter Tiana Gia how to properly wash her hands -- and she loved it.