Is she really that smart...or was it just good timing?

So, this is the story:

Joe picks up the girls from daycare this afternoon. He says to Leah
"What did you learn about it school today."
Leah said, "We learned about the letter T."
Joe said, "Can you tell me some words that start with T?"
and before Leah could answer, Amber said "Two"

Appartently this started Leah and Joe laughing fit that lasted 5 minutes!