548. A muggleborn made the mistake of bringing in Monopoly and teaching people how to play it. The game resulted in a traumatized giant squid, an utterly destroyed Herbology classroom, what the house elves call “The Great Boomy Poof and Roar”, and a blood feud between the Gryffindor and Hufflepuff sixth years. The winner was Moaning Myrtle.
540. A pureblood ranting to their muggleborn friends about famous witches and wizards the muggleborns have never heard of until they can’t take it anymore, and the muggleborns start fangirling about Tom Hiddleston and Benedict Cumberbatch. The pureblood just stops talking, slightly scared by their passion.
538. After the Battle of Hogwarts, Professor McGonagall made a Muggle Week where muggleborns and muggle-raised halfbloods would share some muggle culture. It became a tradition and, more recently, every year there’s some Pitch Perfect inspired group that will perform a capella mash ups. The purebloods love it.