Lichtenberg figures (sometimes called lightning trees) sometimes occur when an electrical charge is introduced to an insulating material, representing the branching electrical discharges. They can occur in resin, glass, grassy fields, and, if you're unlucky enough to be struck by lightning, human skin.
Remember how Jupiter just got totally rocked by a huge object, leaving a giant scar? The Hubble team interrupted their testing of the telescope to aim its sights on this very rare sight, and captured the clearest photo yet.
Well, it probably couldn't have happened on a more appropriate anniversary*, but some bored astronomers apparently spotted a new dark "scar" on the surface of Jupiter indicating either impact by a comet or a planet in serious need of anti-depressants.