I have R in two of my classes. He's definitely a character in both.
Today, in theory, more music analysis. A brief five-measure blurb (J.C. Bach) is played, while we're studying the printed music on our pages. Our instructor asked us to describe what was present in the first measure. R immediately informed him that it was a twinkle, amusing us greatly.
After we'd finished that particular bit (R found two more twinkles in it), I called across the room,
"So, is a twinkle a major trill, or any trill?"
"Y'know what? It's anything by J.C. Bach. That guy's a whole lot of twinkle right there. And not good twinkle - that's bad twinkle."
You'd probably have to be a music major to get the bit about J.C. Bach (not to be confused with J.S. Bach), but anyone can see that there must be a difference between good twinkle and bad twinkle.
Ah, how I enjoy R's commentary.