I know what's inside a television...

A few days ago my four year old daughter and my wife had this conversation:
"Mummy, what is inside a television?"
"You should ask Daddy that"
"Does Daddy know what is inside a television?"
"Yes"
"Good"

And that was that. She has since then never asked me what is inside a television, she simply seems content in the knowledge that I know.

Armed with that knowledge, she has since been overheard asking other kids at her nursery "Does your Daddy know what is inside a television?" - but other four year olds don't seem to care about this issue.