Every molecule of water on the Earth and inside you or any other living thing has existed for billions of years. After it came to Earth, that water has been cycling through rocks, air, animals, plants, and back again. Each molecule has been on an incredible voyage before coming to you. At some point, the water inside you would have been inside dinosaurs, bacteria, the oceans, storm clouds, the polar ice caps, and much more.
Water is strange, and the video does a fairly good job of describing it's weirdness. But I wish it could have gone just a little bit deeper.
And it is mind-blowing to think that all water on this planet is alien.