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Hey people,
i watched this movie as a kid but yet to findout what it was,
so from what i remember of the movie this is what happens:

person gets sawn in half as a magic trick at a birthday party by psycho mother then ambulance comes

Then at the end her sister is in some weird factory or mental hospital, and all the people are making dice I think. then the last scene shows her holding her own pinky finger

weird movie but thats all i remember, anyone can help out a name?

thanks