The Water Bucket Filling Game:
The aim of the game is speed not efficiency.
Empty bucket continuously slide by (on a conveyor belt or something) and you have to fill them by holding down a spicket of water that fills the buckets. You could hold it down even in between buckets but speed increases filling them most full – but speed and numbers increases “profitability”.
However, the game still tracks how much water that you waste in the process of fulfilling your tasks. As you keep playing it, the player starts to try to conserve the water and not waste it (or purposefully waste it depending on the player mindset)
The point is to raise awareness subtly through the gameplay about water supply and doing a task with speed and not worrying about the consequence essentially.