[courtf]

What is the most impressive programming feat PG ever accomplished? A Lisp dialect maybe?

I sort of get the sense that he doesn't realize how many crazy talented (but not famous) programmers there are out there. He's got a microphone and is determined to keep using it to tell us how great his ideas are, but the audience has gotten a lot more discerning since the 90s when producing a CRUD app in Lisp could still be considered a feat.