Keyboard Cat: Earned $21,100-$175,800 Annually

The original Keyboard Cat video was made public in 2007 — but his owner filmed it back in 1984. Keyboard Cat, whose video has been viewed nearly 71 million times, is likely the genesis of a common knock against YouTube as a place to see “cats playing pianos.” The Washington Post estimated that the cat, who died in the late 1990s, could now be worth up to $175,800.