|Image: Wizarding World/Universal (CC BY-SA 4.0)|
The Wizarding World of Harry Potter has embedded itself into the hearts and minds of a generation of Americans. The books and films having a predominantly British background were, for the most part, translated into American English when released in the USA. For example, the first book 'Harry Potter and the Philosopher's Stone' became 'Harry Potter and the Sorcerer's Stone' in the US. Some of the food items and mechanics of Hogwarts School in the books were assumed to be an invention of Rowling and not just an everyday, normal British thing.
What did you assume was an invention of JK Rowling?