Cats have been fooled into chasing specks of light since mankind first picked up a shiny bit of flint and wagged it in the direction of the nearest sabre-toothed tiger.
We're guessing, anyway - if you'd watched as many cat videos as we have, you'd think that too, trust us.
Anyway, we mention this particular cat-teasing technique because a YouTuber has recently uploaded an absolute cracker of a cat-chasing-the-light video, making her ginger puss scrabble around the floor like he's tap-dancing, desperate to pounce on this extraordinary flash of white.
All it needs to achieve a internet gold medal for animal viral videoness is an accompanying piece of music - the soundtrack to Top Hat perhaps? Get on it internet, quick smart.
And while we've got you thinking about cute cat videos, here's a gallery of a bunch of felines standing up to animals twice their size. Enjoy!