Not to be pedantic, but "Avarda Kedavra" is one of the stupidest world-building choices ever made in the wizarding world. I know that magic is supposed to make everything easier, but I don't know if killing should be one of those things. If a muggle wants to kill someone, they have to take some form of violent action, whether that be direct or indirect. If a wizard wants to kill someone, they only have to say the magic words. I'm sure that the Weasleys, Malfoys, and other wizarding families sat down with their kids and explained to them the importance of never saying "Avarda Kedavra" as a joke, but I still don't wholly trust this society not to have accidental child murderers. If you think this phrase is mediocre worldbuilding at best but makes up for it by hilariously explaining the muggle phrase "abracadabra," these Harry Potter memes will Avarda your Kedavra.
