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Roseanne (ABC)
Depressing finales aren't necessarily bad, even if you're a comedy. But revealing that the entire last season of your series has been a story your protagonist has been writing to keep herself sane, and all the characters' victories never happened, is perhaps more of a wrist-slitter than most people are comfortable with. Dan really did die from the heart attack he suffered in Season 8, no one won the lottery, life is just one long slog toward the grave, etc.