Parens Rock

I was reading this profs page from Brown Uni, on how to contact him. Here's the relevant excerpt:

indicates that you've read this page by including the phrase “parens rock”,

Is he a /prog/rider? Note the delicate quotes. Parens rock? Come on.

cs.brown.edu/~sk/Contact/Students/

http://cs.brown.edu/~sk/

https://en.wikipedia.org/wiki/Shriram_Krishnamurthi

http://cs.brown.edu/~sk/Publications/Books/ProgLangs/