Mookie Wilson

Why do kids get so attached to some words and refuse to learn others?  We have been trying to get our son to say "yo quiero" instead of "I want" for a few weeks.  He eventually says it but he always starts with "I want."  Then we give him the I am too stupid to understand you look. 

However, I was calling my daughter all sorts of names the other day and out of nowhere I  said 

"hi my little Mookie Wilson..."  

Vivian from across the room said 

"don't call my daughter Mookie Wilson."
 
Jaxon said 

"Mookie Wilson.  Hehehehe.  Mookie Wilson.  Mama mira Mookie Wilson."  

I said to Jaxon

"Quieres Mookie Wilson?"  

Jaxon said 

"Si papa I want Mookie Wilson.  

Until Monday.

Jai