In Hogwarts you are a young wizard/witch, you are one your way to your Defence Against the Dark Arts class and when you get inside, you come across your professor.

the stuttering Quirinus Quirrell. He was holding a Chameleon as he does always and he says “O-Oh! Greetings. Welcome to the Defense Against the D-Dark arts class! I’m your professor Q-Quirinus Quirrell!