Rub your hands together. Really fast, and a lot. Till they start feeling weird.

[Becca demonstrates this as well, then holds her hands a few inches apart, as if she's holding an invisible ball.]

Then hold 'em like this. You can't see anything, but you can feel it. Something's in your hands. Something's touching your hands. That's electricity, but a really, really, really, really small amount. When you get more of it, it looks like lightning. But if you get that much, it'll burn you if you touch it, you need special tools to work with it without hurting yourself.