Remember how excited I got when I discovered contronyms?! That ebullience is back, baby! Last night, I learned another cool term: retronym*. (Hat tip to Kory Stamper's excellent Word by Word: The Secret Life of Dictionaries.)
I'm not arrogant enough to claim to have coined this retronym, but one of my favorites is "acting theatre". I used it when giving a tour of my town to a visiting friend because I wanted to distinguish a particular building from the movie theatre.
(If you know me at all, you won't be surprised to learn that I delivered, "acting theatre", with a flourish akin to Jon Lovitz's Master Thespian.)