The mood of water
Dr Emoto discovered that the crystalline structure of water changes according to what it was exposed to. It turns out that the crystals that water form when it freezes look beautiful after being exposed to love, and crappy after they are dosed with hate.
After two bottles of water are left overnight on a piece of paper, the crystals they form depend on the words we have written on the paper. The same happens when a group of people focus on love and sends it to a bottle of water, even if that bottle is locked in a safe on the other side of the globe, or when certain types of music is played to the water.
Which just goes to show that "Love, love changes everything...", and that you have to be mindful of water because 75% of our brain consists of water (99% if you go according to molecule count).