'Night Mother starts off with a real bang -- or at least, the promise of one -- as Sissy Spacek declares she will be shooting herself shortly. What follows, sadly, is 90 minutes of bickering with mom (Anne Bancroft, spooky as hell), which drag things down irrevocably. Will she go through with it? Why does she want to kill herself, anyway? Oddly, it's the former question that holds all our attention.