Restrain someone to a table then cut out their belly button. Take one of those cake icing things and squirt peanut butter inside them. Stuck a hungry rat in a big soup can upside down over the hole. Stick a lighter to the can so it gets uncomfortable and starts to eat through him all the while Beethoven's symphony is blaring in the expensive Bose noise canceling headphones he's wearing at a just barely unbearable volume. After a few days I'd throw him in a completely silent room for a few more days. After he starts to lose it I'd then finish off telling him he can go free if he makes it through a corridor to the exit. The floor is a tread mill I can control and right as he is about to make it I turn it up to the super fast setting and launch him back followed by inducing a kidney stone release. After -blam!-ing with him for a few hours I let him reach the door only to find himself trapped in with horny gorillas and the door locked behind him.