"Good morning, I suppose I should explain what Professor Tonks and I found so amusing. I was raised in the muggle world for reasons that are no one's business but my parents, so don't even start asking. I am not a teacher, I will hex you. Headmaster Snape has turned the Great Hall into a university lecture hall. A place where muggles gather for advanced classes. I will leave explaining the intricacies of them to Professor Tonks next year, but this ties into what we wanted to show you.