Children say more than their words

When introducing to my kindergartners a new book, Ten to Tango, a counting book of animals dancing, I inquired: Who knows what "tango" is?
answers: a banana, an animal, etc.
LaDarius: a dance
Me: Very good! How did you know that?
LaDarius: I play video games and watch TOO much TV!

So who says TOO much TV is bad if it helps build one's vocabulary? But then I am wondering WHAT in the world was he watching that he learned about "tango?"