We have experienced the "Roar" and the snakes in question were throwing around the front half of their body with mouth open. That roar was not from their mouth though and was followed by an explosion of poo.
It was louder than the Tv, scared the dog, scared Corey and I. You should have seen the three of us rushing over to investigate a snake fart. That was followed by "OHMYGOSH! It's everywhere!"
Since it's the holiday only myself, and one other person showed up for class today. Now, I'm sitting in a empty classroom with my professor, laughing my ass off lol.