Muggles in unexpected places

So…we’re playing a Harry Potter game in which our fellow students are characters from other books and stories. One of the players is playing the Princess of Magical Australia. She had a special magic power that makes it so that if she shakes someone’s hand, she sees the alternate universe the other students actually come from.

The Princess shakes the hand of Dean Winchester from Supernatural and finds herself in a cage with a vivisected Dean and…the Devil. The following conversation takes place:

Lucifer: “Who are you?”

Princess: “I am the Princess of Magical Australia.”

Lucifer: “Who? What? There is no such place!”

Princess, haughtily: “Oh! You are a muggle!”