Is it terrible that I'm imagining Holmes in something completely inappropriate, like Divination? I think he'd have fun, deducing things about students and passing them off as predictions before he loses his patience and starts teaching his students how to pay attention.

(Divination soon goes from being the magical equivalent of underwater basket weaving to the most popular class offered at Hogwarts in a matter of years. The School Board is astounded. Head Aurors Potter and Weasley's only comment on the subject is that it just isn't fair.)