Edward hyde did story about Halloween executions like that :)

My idea of the game like that woud be when 2 girls are administering electric shocks to each other Until someone dies.
Or another version where one is supposed to keep another alive by taking her shock for herself :)
Or just single player version where she has to choose the prize and gets shocked with random strength, if she survives she takes it.

Considering how that should look like, shocks would be administered to the nipples as usual.