[MIchaelTArchangel]

The guards need to insert what looks like a light bulb into the fixture in their cell, but instead of giving off light directly, it will give off intense heat and any attempt to unscrew the light bulb will bring the person in the cell into contact with the electrical circuit. They will either be cooked or electrocuted. It would be their choice.

[GonzoGOP]

Nope, Chinese method. Just take them out back and put a high velocity slug into the back of their heads. There is not great ceremony to taking out the trash. They are garbage and simply need to be disposed of in the most efficient way possible.