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".
http://en.wikipedia.org/wiki/syphus">wikipedia.org/wiki/syphus
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http://youtu.be/3AmVBBPZfl8