Dear Jonathon,
Something like that will give you a continuous
tingle, although this does sound a little like the electric fence
phenominon. You grab the fence and take the pain and ask someone close by to
shake hands with you spontaneously and laugh as they get a decent whack.

As for the practical side of things, I still recommend the earlier use of
555 / transformer / transistor. Something that delivers a smallish shock, ie
50 - 100 Volts, at very low current, less than 1 mA would be the go. Hunt
around on the net

Paul