This is the conversation I heard through the baby monitor a couple of hours ago:
Betty: I spy with my little eye something beginning with W
Betty: No Dolly, no no no, door does not begin with W. Try again. I spy with my little eye something beginning with W
This sequence happens about five more times before Betty starts getting really cross with Dolly
Dolly: Please stop being naughty to me Betty, I am only two. I don't want to play I Spy any more, I want to go to sleep.