ng-conf tweeted that they had some easter eggs. YouTube annotations seemed like a good place to hide one, so I scraped the annotations from their videos.
First, can we programmatically get annotations? Yes! Googling around reveals URLs like
https://www.youtube.com/annotations_invideo?features=1&legacy=1&video_id=QHulaj5ZxbI
Second, how to get a list of all their video IDs? Quick and dirty! I opened their channel's video list at https://www.youtube.com/user/ngconfvideos/videos and used my browser console to scrape out the video IDs: