The walls in your house are all bashed up because you went around whacking them with a blackjack to check for secret passages. "If it makes a sound, it must be a movable piece of geometry!"
I came up with this because I was playing an FM and I entered a huge library. I began to think the author would hide some passage along the wall so I began hitting the walls and then I thought "what are the guards going to think when they wake up and see my remodeling job?".