Rapping and Tapping

[Post updated with actual sketch by the Dude's partner in crime. This is a cross-sectional view of our house, showing hidden passages.]

The Dude is enjoying Day 1 of Spring Break. He had a friend sleep-over last night. The two were asleep by about 9:30 - amazing! This morning they are amusing themselves by searching for secret passageways in our house. They spent close to 1 hour going from room to room, tapping and rapping on the walls looking for hollow spaces. Then they found a notebook and started diagramming the house.

Seems like innocent fun? Hmm - could be. On the other hand, I did talk them out of screwing the grate off a heating vent. I suggested that they could get into a lot of trouble if one of them got stuck in the walls.

"No problem," said the Dude, "we'd just call the fire department and they would use a hammer to knock us out of the wall."

I'd hate to explain that to the insurance person.