A Happy Birthday song

Chris' birthday was last week.  As he walked in the door from work, Karis came in to greet him with a birthday song.  First, you must visualize how she looked.  She had on a red football jersey with a red ball cap on turned around backward.  She walked up to him, without saying hello but just started singing.

Happy Birthday to you, cha cha cha

Happy Birthday to you, cha cha cha

Happy Birthday dear daddy,

Happy Birthday to you... YO.

As she said "yo", she made the "rock on" sign with her fingers.

Where does she come up with this stuff?????