So, you may seen the Twitter post making it’s way around claiming there are rules about language we didn’t know we knew. It’s from the book, The Elements of Eloquence, by Mark Forsyth.
Here is a BBC article on the viral post, and here is the paragraph in question:
Adjectives in English absolutely have to be in this order: opinion-size-age-shape-colour-origin-material-purpose Noun. So you can have a lovely little old rectangular green French silver whittling knife. But if you mess with that word order in the slightest you’ll sound like a maniac. It’s an odd thing that every English speaker uses that list, but almost none of us could write it out.