Dancing Lights Against the Sky

When you look up in the sky enough, you'll see some really, really weird things.  YouTube user QuadeM13 was out riding his bike and noticed a strange light beam flashing and twisting around above a cloud. He stopped and took some video of it, and it's, well, really really weird (warning, some NSFW language is muttered therein): So what is this thing? An alien beacon? Thor going back to Asgard? Nope. It's ... ice crystals. Seriously. What's happening here is a wispy cirrus cloud, made up of ice...