Lichtenberg Figures

I recently came across this fascinating image on Facebook.  It shows the interesting pattern left on the green of a golf course after a lightning strike.

A 'Lichtenberg Figure' on a golf course.

Apparently the crazy patterns are called 'Lichtenberg figures', and if you do a Google search for images of these figures you find some other amazing pictures like this one.

Lichtenberg figure on a man's back - struck by lightning!
(from this interesting site)

A quick glance at the relevant Wikipedia page is also interesting.