Trap Lightning in a Block

"To create beautiful electrical-charge patterns like this, you could use a giant particle accelerator. But shag carpeting will also do just fine. Watch how Lichtenberg figures are made in our amazing video. A Lichtenberg figure being created by a tap from a nail. In just a few hundred nanoseconds, electrons trapped in plastic exit suddenly as a bright, branching spark."

Read more at PopSci (Thanks DG)