And I tried for a long time to find one of these. I found something with the basic concept eventually. I think I posted a pic here one.
This does exist. There was one at the church my mother took me to.
"Lori, would you turn off the lights for the slide show please?"
"With the Jesus knob?"
I think about the person who thought of this, and the engineer who designed it,and the stores that bought & stocked it, and have to go lay down.....
I spent two years helping clean out a house in which, the room I slept in, had one of those. I may have posted a similar picture 2 or so years ago.
An electrician could have a heyday with this: a simple rewiring could create “happy Jesus” with the lights off and “flaccid Jesus” with the lights on. But I suppose a lot of priests have already thought of this!