this episode is a two-parter. it's this beautiful picture of where the vapour trails of two jets crossed in the sky one day, and it's also (and this is the good bit) a short avi waz and i made using some footage taken of it.
pretty cool, eh? here's the link. you'll need winzip to extract it (or just a recent version of windows: i don't know what mac users can do) and the divX 5 codec to view it.
good luck. ;]