Speaking of cool to watch, I compete in dog agility, and the last show, a couple of weeks ago, was a couple of miles from Space X's range in Texas. They had two engine tests during the weekend, and even from that distance the noise rattled the arena we were in like an earthquake. A bunch of us would go running outside to watch the enormous cream colored clouds from the tests fill the sky near the horizon. BTW, some dogs totally freaked at the noise (and the sight of their nerd handlers bolting outdoors to see if they were launching Grasshopper didn't help their confidence much, either.) My pups didn't care, fortunately.