No coils usually means no fun
I'm trying to find a very cool site (darn I didn't bookmark...)
which had tons of crazy experiments including - TINGLETRON!!!
It is basically very simple circuit of only couple of components:
Three resistors for current limiting in series with wirewound
potentiometer. I think they used it for 5mA but don't take my word
for it - I don't want to be responsible for anything regardless if
everyone survives or not!!!
Neutral is connected to the metal box that victim holds by one hand.
The wiper of the pot is connected to the metal cap of the
potentiometer which is used with victims other hand.
The idea is tu turn the pot to the max resistance (smallest current)
and offer to your favourite enemy to try to crank it up SLOOOOWLY.
Put a scale or better yet a miliampmeter so everyone can see the
current and cheer the victim to hurt himself even more.
The whole thing is DIRECTLY connected to 120VAC so be EXTREMLY
CAREFULL AND MAKE SURE YOU KNOW EXACTLY WHAT RISKS ARE
INVOLVED. DON'T OFFER IT TO OLD PEOPLE OR KIDS.
MAKE SURE EVERYONE INVOLVED UNDERSTANDS THIS AS WELL
OR BETTER YET, MAKE THEM SIGN THAT THEY DO IT ON VOLUNTARILY
(if that helps something...).
Ask survivors to krank the knob back to minimum current position
for the next victim.