My friend is partial to the one where you are disemboweled, your entrails are wrapped around a stake, and you are forced to march until you die. I of course find capital punishment abhorrent and would never support a barbaric practice such as putting someone in an iron maiden.

My friend is a bladesmith and could make a beautiful damascus steel guillotine blade.

out-of-order

Anything quick and painless, just like with euthanasia.

Green Mario Vigilante Style