Miss Granger was stirring a cauldron almost absently, seeing as though it was only a batch of pepper-up when Professor Snape stormed into the lab.
"Shite," he raged, lifting a ladle full of his latest version of mermaid heart murmur potion to the light. "Mother fucking shite."
Miss Granger rolled her eyes privately.
"God damned piece of merfolk fucking shite," he continued, kicking at the work table, conveniently the one where Miss Granger was working.
"Professor," she began. "This is the fourteenth time you have made a mistake on that potion and I'm getting pretty tired of hearing this. Why don't you just quit being a surly jerk with a nasty tattoo on his arm and just channel of of that... rage, or whatever, into something a bit more productive."
He swirled around, his robes billowing ominously and roared, with complete sincerity, "Despite all my rage, I am still just a rat in a cage."
Miss Granger goggled. "Smashing Pumpkins, sir? 'Rat In A Cage'?"
"Don't be daft, Granger," sneered Professor Snape. "Its called 'Bullet With Butterfly Wings'. Ten points from Gryffindor."