One older gem, uploaded to YouTube in 2007, has generated more than 33 million views. It's called Keyboard Cat. Keyboard Dog, meanwhile, has just a measly 4.6 million.
"The cute factor is very important," said Steve Lozic, 28, while waiting for the show to begin at the Warsaw concert venue in the trendy Williamsburg section of Brooklyn.
Lozic, who works in advertising, said one of his favourite clips involves cats interacting with iPads, with one cat simply "killing it", as it paws at an iPad screen.
The event was a travelling offshoot of the Minneapolis Walker Art Centre's festival of the same name, which now draws 10,000 patrons who ooh and ahh at famous felines such as Keyboard Cat, Grumpy Cat, Henri the morose, existentialist le Chat Noir and nameless kitties trying to jump into cardboard boxes with hilarious results.
The inaugural festival, held last year, received more than 10,000 video submissions from fame-seeking cats - or at least their owners.
The star attendee of Brooklyn's video festival, though, was Lil Bub, a runty kitty who was born with "multitude of genetic anomalies which all add up to one of nature's happiest accidents", according to her website.
Lil Bub, it turns out, is a "perma-kitten" - that is, a full-grown cat that has stayed small and kept kitten-like features. On top of that, she has an extra toe on all of her paws and her tongue is always out because her teeth never grew in.
Lil Bub merchandise, from stickers to T-shirts and baby jumpsuits, has helped raise money for animal charities around the country.
It's hard to say why cats have proved far more popular than, say, dogs in the online video world.
Neysa Smith, 22, who also works in advertising offered one theory:
"Cats are the best animal ever," said Smith, who, like Lozic, painted on a cat face in honour of the festival.
"They are smarter than dogs."
Also spotted at the event were several cat tails and a man with a surprisingly calm grey cat perched on his shoulder.
Not spotted: dogs.
- AAP
