Score one for chalkboards; you can't get this kind of look with a dry-erase board. The message is a nice turn of phrase, very catchy and literal, which works well for this fundraiser to build a reliable water source in Kenya. The video conveys that each of us can help wipe out disease and despair and replace it with joy and hope with a small contribution. The pop soundtrack helps carry the viewer throughout the video.
Give a dam - it doesn't take much to give water to Kenyans in desperate need.