Here is an example...
Ned planned to go skiing with some friends Sunday morning. There was talk - between Ned and I only (or so I thought) of me taking the kid to Chuck E Cheese with some friends. Evidently, Katie has excellent hearing when it is something she is not supposed to hear.
We wake up Saturday morning. Katie is diligently writing at her desk. She presents me with this construction paper bound "book":
Gotta love it!