double checking our receipt

on our way through the store, he spotted thomas the train (or as he calls them: blue train) playing on two display tv's. I didn't see it, so when he randomly said, "train!" I was wondering what he was talking about until seeing it. from then on, he kept asking, "see train?" and asking me to go back. we passed it again, but had to tell him that we'd come back to see it another day.