I have done many things that normal humans cannot do.
I have even bargained with the gods themselves
I have returned to the world of the living from death and the underworld
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It was due to these many acts that displeased the gods that he ended up having to roll the boulder up the hill.
And each time when it looked like it would reach the top or if it really did reach the top the boulder would fall back down and he would have to do it all over again