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It was somewhere in the late 80s or early 90s I believe and it was about a demented grandma, the movie wasn't Grandmas house or the straight to video flick the granny. I remember vividly the tagline being death starts at 90 and there was a scene where the lady chases a dog or cat around in an electric wheel chair and a guy gets killed with a knitting needle. Someone out there has to know what I am talking about.