1st Santa Visit

We visited Santa just before Thanksgiving.  Megan was, again, in awe of the man in the red suit.  Yet she waited patiently in line and went right up to him and climbed into his lap.  When we had discussed visiting Santa earlier, I asked her what she would tell Santa she wanted for Christmas.  She told me she would ask for Dora book.  But once on Santa's lap, she clammed up until Santa mentioned that he was friends with Dora.  I was floored.  How did Santa know we had discussed Dora?  If my 2.5 year old does not believe, then I DO!!!