Blood Rage, 1987
Twins still getting themselves into all sorts of trouble. Must be a
sadist's heaven being able to go around cutting people in half with machetes and pass it off as their brother. What's more, said brother is traumatized into believing it himself, fresh out of the nut house and unable to comfortably re-integrate into the outside world while his friends and twin are all laughing it up and mutilating people and having a gas.