Yeah, you don't expect a lot of explanation occurring between two professionals, especially in the middle of a sword fight.

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The fun bit is that there can be some blurring of the genres, here. 

Liberal Arts may have some very... unusual classes that your advisor has to approve.

This could be some technical classes that require a security clearance and DARPA approval. Try not to stare too hard at Professor Grey, that's how the little guy reads your mind.

Reanimation classes for the surgically inclined. Bring Your Own Igor.

Witch studies. Are you a Wizard or a Warlock?