REGAN: Hang him instantly.
GONERIL: Pluck out his eyes.

– William Shakespeare

King Lear, Act 3, Scene 7. When Regan suggests that they kill Gloucester, Goneril outdoes her sister in viciousness and cruelty by coming up with the idea of torturing him by taking out his eyeballs. This vicious pair haven’t an ounce of compassion between them.