I KNOW A BETTER ONE. what about sneaking acid into their food so you can watch their mouths and the rest of their body slowly and painfully get denigrated by acid and chuckle at the fact that they never saw it coming?
Hmm... Sounds like a book... what that is.. (I know the hunger games) OR We could starve them to death or torture them by tearing their limbs off one by one and gutting their intestines out like a fish