I didn't watch the movie before listening to this episode but it did remind me of a Tree House of Horrors episode of the Simpsons.
When Snake is executed, Homer gets Snake's hair transplanted onto his head. The hair takes control of Homer making him talk and act like Snake then sending him on a killing spree, drowning Apu in the Squishee machine and pulling out Moe's heart with a corkscrew.
The segment is called 'Hell Toupee'. Wiki says it hints at the movie 'Shocker' so maybe you guys can watch that one too and let me know which is closer.