I was looking at the imdb page for Jungfrukallan, and there was a link to a list of well known movies that were ripped off of lesser known movies. The Predator 'original' looks pretty good, although apparently it was never released on either VHS or DVD, so I can't imagine it would be possible to find =/
http://iconsoffright.com/news/2008/07/teds_top_10_thought_they_were.html