Our master bedroom used to have a shelf on the wall for a TV.
We didn't want this shelf. And it was just at the perfect height for us to hit our heads. (Yeah, we're not always the most graceful or attentive people.)
In the name of safety--well, actually in the name of destroying nemeses--one of the first things P did when we bought the house was to take the shelf down. Like, a month before we actually moved in.
The shelf had cable and electrical outlets built right in. When we took it down, we discovered a surprisingly large hole had been cut into the wall to feed these cables. For four months now, we've been looking at this lovely hole over our TV each evening.