For those San Franciscans who happened to be looking skywards on Saturday evening this was the ethereal and somewhat terrifying sight that greeted them shortly after 6pm.
With no prior warning and no immediate explanation - a nuclear-capable Trident missile was launched from a U.S. submarine off the coast of California and sent streaking in all its blue and white glory across the bay.
For a city famous for its lights, this one took the biscuit - and gave Twitter its very own nuclear meltdown with thousands speculating that it was a UFO.
"...Say, 'GOD is sufficient for me.' In Him the trusters shall trust." (Quran 39:38)