The electrical flyswatter as a paddle had occured to me... but I have tried touching one with my hand only and I thought the shock seemed a bit much at first, I only touched it the once which was enough to produce an out loud "holy shit" (I've seen one of those things literally cause a small lightning bolt to jump a couple inches to kill a fly, seems excessive, if amusing). I could see using one, in moderation. In fact, just thinking out loud I think it would make a very interesting punishment device.

One of the things that really caught my interest on this subject was a butt plug you could use to send an electric charge. I can't link directly there due to rules but that doesn't stop me from quoting about it as far as I know. I'll highlihgt a certain section that caught my eye.

"Electric Butt Plug

This black butt plug is made from plastic, with electro conductive strips embedded on each side. The plug has an hourglass shape to conform to anal anatomy. The circuit is completed between the two sides, and the plug produces stimulating electrical sensations wherever it is inserted. This is a fun, stimulation and sadistic toy because it causes the user to have involuntary anal muscle contractions.

Customer Review:
My wife & I bought 2 of these units. The effect is quite unbelievable, to say the least. We play backgammon for sex bets, while each wearing one of these anal electo plugs. When it's our turn, the other turns the EMS controller so that we can barely think to make our move. When turned up higher, you are forced to hump and jump about, with no way to resist the powerful electric pulses. At a medium setting, your anal muscles are forced to butt fuck yourself with the plug. We find this a VERY exciting toy"

I have to admit, that thing caught my interest. Would also consider trying other stuff too of course, though without having really tried any "official" electric toys I couldn't yet say how I'd react to them.

And you're right CrewDawg, of course start slow and don't go too crazy right off. Safety first, of course.