(1984)
I've watched this movie countless times over the years thanks to a VHS copy I scored from a closing video store. Now, I actually own this movie on DVD! It's part of a four pack from Scream Factory. I've never even heard of the other three movies, but they seem right up my alley.
When I put the movie in, I noticed something weird. All my life, I remember the credits starting first thing. On the DVD, however, we get a cold open. I was confused, and was telling my wife that I didn't remember any of what we were seeing. Paul (our hero), was chasing a woman through a bunch of corridors. When he finally catches up to her, she immediately disrobes. Completely naked. I really think I would remember full frontal nudity like that.