Lemon Tree Thunderegg According to ancient Native American legend, when the Thunder Spirits living in the highest recesses of snowcapped Mount Hood and Mount Jefferson became angry with one another, amid violent thunder and lightning storms they would hurl masses of these spherical rocks at each other. The hostile gods obtained these weapons by stealing eggs from the Thunderbirds' nests, thus the source of the name "Thundereggs. http://www.naturenw.org/rock-thundereggs.htm for more info.
This photo shows an aerial shot of some clouds forming what is called a Von Karmen Vortex street. This phenomenon is caused by the separation of different fluids or gasses when passed over a significantly blunt edge. This shot is specifically taken near the Juan Fernandez islands just off the coast of Chile.