This came to mind last night, the dialogue really seemed to be of the David Tennant Dr. Who's style, though I'm not sure that Dr. Who would be discussing the subject of Astral Walks but hear that style for the teacher.

Student: So, when you walk through the Astral plane, you should have some sort of guardian, right?

Teacher (distractedly): Oh, yes, that's essential.

Student: Like a dog or a cat?

Teacher(distractedly): Never, pets like that are rubbish. The dog will be too focused on attempting to go with you and the cat can't be bothered to worry about you. No, that'd never do.

Student: What should you have then?

Teacher (suddenly animated): A Guinea Pig! Oh yes, you may think that sounds crazy but Cavia porcellus is the best type of guardian. They're very alert to what's going on around them, both in the normal and the astral plane. And have you ever been bitten by one? *shakes head* Sharp little teeth. They can both fight off whatever might come attack you and wake you up out of the deepest astral trance. Yes sir, for my money, it's a Guinea Pig over a cat or dog any day of the week.