Today's YouTube sensation doesn't feature funny animals, drug-addled kids, or any of the other usual viral video tomfoolery. It's actually kind of a downer. But photographer Michael Deppisch's moving montage of the flooding in Nashville is worth watching anyway. After all, as Mashable points out, amateur disaster videos tend to be blurry cellphone affairs, not high-definition art like this. “This video so captured the heart of this story,” wrote one commenter. “If it doesn't move someone, they should check their pulse.” (More viral video stories.)