Well, the ground has a negative charge to it.
The atmosphere surrounding us has a positive charge.

Ever get zapped on a metal table, pole, or other metal thing that is connected to the ground in some way? That's right, you are grounding yourself, the same way lightning bolts do it.

I walk in bare feet everywhere. People around my neighborhood here think I am a bit weird by never wearing shoes, but whatever. I'm also one of the strongest, healthiest people in my neighborhood. :)

Like a magnet, these opposites attract and then the electrons can flow, just like an electrical circuit.

I like to think of this plane that we live on as a huge, battery-powered clock.