I think I know what you’re talking about. It was one of those odd little film shorts HBO used to run in between movies in the 80’s.
I don’t remember this short, but I also remember when HBO used to show short films between features. Seems like now they just show ads. 😦 I remember one in particular that was like a ghost story—it was kind of interesting.
I’m surprised they were able to use a Vader mask, for copyright reasons. They couldn’t even use one in Revenge Of The Nerds. 😛