"Don't mention the word furrier...!"

"Beorn the Berserker" by Greg and Tim Hildebrandt, from the 1978 J.R.R Tolkien Calendar.

“If you must know more, his name is Beorn. He is very strong, and he is a skin-changer.”

“What! a furrier, a man that calls rabbits conies, when he doesn’t turn their skins into squirrels?” asked Bilbo.

“Good gracious heavens, no, no, NO, NO!” said Gandalf. “Don’t be a fool Mr. Baggins if you can help it; and in the name of all wonder don’t mention the word furrier again as long as you are within a hundred miles of his house, nor rug, cape, tippet, muff, nor any other such unfortunate word! He is a skin-changer. He changes his skin (...)"

J.R.R. Tolkien, The Hobbit