A few weeks ago we happened to visit the Smithsonian National Air and Space Museum and had a great ol' time. During the afternoon, while we were in one of the exhibits, I heard some music playing and thought they were starting to play some festive music because it was coming up to the holidays. Soon afterwards the music stopped and people could be seen walking around carrying musical instruments. I forget what I was doing at the time, or where I was going, but evidently I was distracted as I quickly completely forgot about seeing the musicians. That is, until today when my father-in-law told me about this video of a flashmob at the museum. I don't know if they did it multiple days, I suspect they did, but it was cool to be there.