Norway Spiral from 2009 "At least this failed test made some nice fireworks for the Norwegians." It was apparently Russian military missile tests:
https://en.wikipedia.org/wiki/2009_N...spiral_anomaly
In case there are too many words there for people to digest in the wiki article, here's a bit of explanation " Prior to the Russian statement, Jonathan McDowell, an astrophysicist at the Harvard–Smithsonian Center for Astrophysics, had already suggested that the unusual light display occurred when the missile's third stage nozzle was damaged, causing the exhaust to come out sideways and sending the missile into a spin."