‘Poor Little Fish’ from Yan Lu may be one of the best ways to get people to use less water that I have ever seen. This design simultaneously drains water from a fishbowl as you use it to wash your hands. The more water you use, the worse the fish's chance for survival becomes.
There are two separate pipes separating the fishes water from the tap water. Risking a fish's life to help you cut down on your water use may be a bit drastic, but you can’t argue the fact that ‘Poor Little Fish’ gets its point across loud and clear.