[rusbus]

Here's a summary, but really you should watch the video, it is great.

Take 1km of wire, a resistor lightbulb, and a power source. Connect oscilliscope around power source. Flip switch.

For 1 light-speed delay, you actually see current going across the lightbulb! After the speed of light delay, current starts flowing normally as expected. (Why? How? Is this spooky action at a distance?)

You're actually seeing cross-talk between the wires where the build-up of electrons on the high side actually moves electrons on the (spatially) adjacent side of the loop!

Then to really complete the puzzle, sever the end of the wire. You still see the exact same behavior up to the speed-of-light time! (Which, how could you not! You need to wait a speed-of-light delay to _discover_ that the wire was severed, so you MUST see the exact same behavior.)