I guess I had a "sleeper pow day" once. It was at Anthony Lakes, Oregon. Smallest mom and pop resort you could ever imagine. 1 lift, 900 vert but some good short side country hikes. It was my first day ever skiing this mountain, happened to hear it got some snow before everyone else and I was staying in Boise, Idaho a few hours away. Had no clue what to expect... but the lift ticket was a whooping $17 and they had powder. Obviously there were only about 20 people skiing the whole mountain and I doubt they ever see crowds of more than 100 even on non "sleeper" days. Well this is what happened:
https://vimeo.com/55249669