This one time? In our old house? My husband and I decided we wanted to put in a light switch to power an overhead light attached to a ceiling nipple, which we presumed had been controlled by a pull-chain, like the other overhead wiring in the house.

My husband cut into the plaster with a saw, only to rapidly hit metal. It was the former switch-box. Plastered over. With the *live wiring* still inside of it.