Bit of a drip.

I had a bit of a eureka moment at work when someone was ranting on about how if a tap drips 3 times a second for a week, you've effectively wasted 5,000,000,000,000,000,000,000,000 litres of water. I'm all for doing my bit to save the planet but rather than someone ranting about it why they just didn't turn the tap off I don't know...