Not sure if this is already known, but spark the right end(Not sure why left does not work) of it and you'll get a bouncing spark. It'll never get lost so you can attach electronic devices to it. Not sure if it's useful either.

Made something that shows what can be done with it. Or something.



And in this one, if you attach a NTCT wire and a PTCT wire..

When the spark goes to the left, it's conducted by PTCT. And when it goes to the right it is conducted by NTCT.
So when it goes to the left, it conducts to the PTCT at the top but not to the NTCT.
Same for the other direction, only inversed.