Wienzek, who says he doesn't really use YouTube anymore, seemed genuinely surprised to learn that the clip he'd uploaded all those years ago has been seen well over 16 million times.
"It's just a lot of puppies, and one cat," he says. "I guess people like cat videos."
And indeed they do. Not only are cat videos among the most viewed videos on YouTube, they've become a staple part of popular culture in the real world as well. So much so, in fact, some feline stars have even gone on to become household names.
But cat videos actually pre-date the internet by more than a century. Here's what is believed to be the first ever film of cats, recorded in 1894 by another cat video pioneer, Thomas Edison.