According to the Greek myth, Zeus punished King Sisyphus (not a nice guy, look it up) by condemning him to live in eternity with only one task: roll a boulder up a hill. The boulder was enchanted so that it would slip from Sisyphus’ grasp as he approached the top of the hill, and every day Sisyphus would have start again. Wasted effort, no results, an eternity of futility.