Truth or dare? A critical madness
This is a terrible 80's movie about a man who catches his wife having an affair with his best friend and goes on a killing spree. It features many great scenes that could be riffed including games of truth or dare that end in: faces being peeled off, grenades exploding in mouths, fingers being cut off.. complete with super cheesy special effects make-up. Pair that with "Birdemic" quality camera work and sound and you have one of the corniest 80's slashers around. Perfect for riffing!
Link to IMDb page:
Link to trailer: