Does Professor Snape teach ballroom dancing to Slytherins?

What? Must Minerva McGonagall get all the glory by her gifted Griffindors?

Apparently not! I'd have thought the potions master would have used the opportunity to distill endorphins from the pale pink fogs of interpersonal confusion, not, you know, terpsichoreate per se.

But yes, I should have realized that "Slytherins will be Slytherins."