Aurora Borealis.

I saw the Northern Lights once, on a late-night drive from Canada back to our lake house in Michigan. Watch this video, taken when an Air France flier found himself with a whole row to himself on a San Francisco-Charles De Gaulle flight. He set up his camera and a tripod and shot a time-lapse of the entire flight out the window. As the place passed over the Arctic, he caught the Aurora Borealis. Promise it's worth your time.

SF to Paris in Two Minutes from Beep Show on Vimeo.