Yup, good video.Not sure many of our SBO brothers know the reference.
News reel from the site.
I have seen my halyards start to do a very similar oscillation in high winds... and realized that any unsecured longer length of line is just merely asking for the right wind to push it into harmonic oscillation like that... once that starts, the whole rig starts humming and really... it's just not a good thing.