I just have not heard any response yet that really demonstraits this idea as being a bad one.
If someone hooked a huge siren to a dead breaker feeding a circuit that I was working on, and then turned that breaker on, three events would occur:
1. I would jump, startled, and get zapped. 2. I would get up and hammer that siren into little bitty pieces. 3. I would find the guy that thought it up.
Kidding aside, I believe the spooking-into-the-danger factor is just too great, bud.