My favorite is PG's request to limit the fluff and get back to technical discussions like posts about the "Innards of Erlang": https://news.ycombinator.com/item?id=512145

Which lead to the famous "Erlang Day", making the HN homepage look like this: https://www.flickr.com/photos/stilist/3348380060/in/photostr...

Interestingly, this day is what personally introduced me to Erlang, and it's been my primary programming language since.