

I used to play a game with a small group of people called “non-colloquialism” where it was forbidden to use any contractions, abbreviations, slang, etc. There were some contentious rules like whether “fax” was acceptable, but “OK” definitely was not.

Not a massive penalty, it was just that everybody else would be really smug about how uncivilized you were. It could get annoying when you had 5 people doing a performative mockery of a late 19th century aristocratic stereotype in chorus. Lots of “Oh dear” and “I say” and miming of the adjusting of a monocle.