Power source - your neighbor's junction box, what else? The two black wires coming in are yours
Cables too short, just twist them together. Oh yeah, the rocks keep the twisted wires from getting pulled apart
So you need a switch for multiple purposes? - Piece of cake, two nails in a board. Note that the white cable is switched into the "off" position.
Extension cable not long enough? Cut plug off and twist bare wires together
Yup, it is an extension cable like we said
Oh yeah, the white cables that are switched at the board with two nails? A massive compressor - and you thought a light bulb