Beetlejuice

It's a Wonderful Afterlife (4x28)

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Yes, you've guessed it: Beetlejuice has an off day and wishes he had never met any of his friends. Clarence Sale shows up and shows him what the Neitherworld--and the real world--would be like without him. Seeing Lydia miserable and friendless convinces BJ to change his mind, and Clarence is rewarded for his trouble with a shiny new car.