I'm trying to remember the name of a movie that had about four-five teenagers/college students being killed off one by one by the alcoholic dad/step dad perhaps. One scene involved a girl being killed by a large shark hook type thing as she was being held down on a work bench. It seems it was set at a beach/summer house. I also remember seeing a harpoon/gun type thing that was hanging on the wall and then missing. I would have seen this at some point during the eighties, but cannot come up with a title. Thanks for your help.

I Know What You Did Last Summer?

No. That's not the one. It was prior to that. But thanks though!

The Mutilator (1985) (http://www.imdb.com/title/tt0124014/)

OMG!! That's it. Thank you so much! By the way, if you are in to b-movies, that one is good! Thanks again.

You're very welcome. I've come across other people asking about this film, I'll have to check it out.