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Nightmare Fuel: Prison Break
All the torture scenes in Panama, but particularly Sucre's. He is forced to dig his own grave and then interrogated while being buried alive. Doubles as a Crowning Moment Of Awesome, since Sucre refuses to confess where Lincoln and Michael are.
Any scene where they take out the saw and the plastic bags in the context of disposing a corpse (who is still alive, by the way, and listening).