Silly question, but I’ll ask it anyway.

One can’t help wondering if the car would run better if the spark plug wires were all in the correct direction. Hmmmmm...

Just wondering, but can you make an interconnect with spark plug wire?

Why yes, MacGyver, yes you can. But it would be a lot more impressive to make one with pencil and paper. Graphite is conductive, you know. 

Oh wait! I know! What about Wrigley's chewing gum wrappers? Hey, this is fun!

why is or isn’t this done?

Uh, sound quality?

Or. Your could have said the reality of the situation- you just don’t know. Got it

If he just went ahead and said that, then he wouldn’t be his usual charming self...

@last_lemming

Wouldn’t work for interconnects. There is only one conductor covered by a very high voltage rated insulation. You need two conductors for an interconnect. A supply and a return.

Next problem the conductor is usually made of compressed carbon powder. Carbon is not a good low resistance conductor for low signal voltages.
Jim