Oooo . . . Ahhh . . . *dead*
Those of you who were trapped in a snowbank yesterday might not have already heard about the strange light that appeared in the sky above Norway (more pictures of that at Geekologie). Now a possible cause has been hypothesized by the always-brilliant Phil Plait over at badastronomy. (ALWAYS! Did you just question my adjective? I will fight you.) He thinks the spiral was caused by a particles being spewed from a spinning booster rocket. Below are two videos of the phenomenon over Norway. The third video is a computer simulation of spiral ejecta from a tumbling rocket. When viewed from the right angle, it looks very much like the light over Norway.
[Thanks to Geoffrey for the tip.]