So, you've turned off the power at the circuit breaker panel or fuse box, and now you can get to work doing that little electrical update or quick fix, right? Not so fast. Is the power really off? Really really? How about testing the outlet, switch or ceiling receptacle with a voltage meter just to make sure? Or turning off the power at the master switch? Are you sure now?
There's really no way to put this delicately. Electricity can kill you, maim you and/or start a fire in your home. There's an old electrician's trick: If you have a doubt about a connection, lift your left leg off the floor and grab the wire with your right hand. That way any current going to ground will bypass your heart. Do you really want to risk it?