In Greek mythology syphus ( /sɪsɪˈfʌs; Greek: Σίσυφος, Sísyphos) was a king punished by being compelled to roll an immense boulder up a hill, only to watch it roll back down, and to repeat this throughout eternity. He is also found in Roman mythology.
The word "syphean" means "endless and unavailing, as labor or a task".
This movie hits you over the head with this. Check out my review.