Not nearly as exciting as it may sound, but I have a playlist of videos I have "Unlisted" for whatever reason. Maybe I wanted to redo it, take something out, put something in - maybe there was a mistake - who knows. But for whatever reason, the videos on this playlist have been unlisted. As I say, nothing to get excited about here - they were unlisted for a reason. But if you're really just dying to dig into the dregs, have at it!
As I post this link, there are over 200 of these unlisted videos, and I typically unlist yet more videos pretty regularly, so that number will certainly grow. Also, these unlisted videos re in no particular order within the playlist.
You can click in the image below to view: