Here's an idea. More of a sadistic thing than anything. It's probably not as good for extracting information, because it relies on the subject believing that they're alone. First, make sure the subject is unconscious. Place them in a cheap coffin (one that they could expect you to bury them in.) bury them in a shallow grave and allow them to regain consciousness and boom. The simulated feeling of being buried alive and left for dead. Another idea is to just place someone in an appropriately modified sensory deprivation tank as a substitute for the buried coffin. As far as execution, one thing you can do is calk someone's butt and feed them Chipotle until the bitter end ._.