Lightning.

EDIT: And fog and rain. Can't forget the fog and rain.
AR15 Reviewed by AR15 on . What is nature's most exciting (coolest) occurrence for you? I could make a poll, but I feel to lazy right now.. but I could name a few that I think are pretty cool... tornados- WHOA! thats some fast wind.. Fire- I like fire:rasta: oh yeah, and waves..waves are cool:cool: Rating: 5