As a fan of music videos, and flash mobs, this sort of thing makes my day.
The classic. The all-time great: MC Hammer flash mob in some random LA clothing store.
This might be the same peoples. I love them. If they were for hire, I’d bring them for parties.
Even hippie ninja pirates type get into it, lulling you with their Singing in the Rain thing before busting out the Hammer.
Finally: The Boring Accountants dance badly, but at least they TRY, and have fun.