This one was super popular with my friends and I - and I am not sure we ever found out what's really (or not?) happening in this movie. It's a 1995 danish B-Movie - but one we love - and maybe you should give it a go.

Here's a trailer: https://www.youtube.com/watch?v=Jv9eVIqBIVU
And IMDb: http://www.imdb.com/title/tt0114443/

Cheers and have fun :)