The boys are really interested in looking under the doors to see what they can see. It can be the bathroom door, the bedroom door, the door to the pantry. They even try to look under the front door and get mad when the get down to look under it and then can't see anything.
The Girlchick and the boys have turned it into a game. She knows if they are around and see her go and close a door they will come over to check it out.