A couple of lightning bolts.
And a fun lesson in which camera not to buy for photographing lightning (or anything that happens in the dark, for that matter).
The grain is a feature of this picture, it's meant to represent the lightning's desire to flee the clouds and join with the ground as one harmonius unit of..oh, who am I kidding. The grain is there because the camera sucks. As soon as I find something high enough, I'm gonna find out if it bounces.
Nice lightning, though.
Lightning Ridge, NSW, Australia.
UPDATE, October 2012: This one's been long overdue for an improvement. Cleaned the image up, reduced noise, tweaked contrast. The original, for comparison, is preserved for posterity here:[link]
I'm much happier with the updated version.