LB someone asked about concertina wire.
i had to hang some when I worked in Colombia.
we had to wear metal-mesh gloves and gauntlets not to cut the crap out of ourselves.
the twisted, spiral kind is gnarly nasty.
anything electrified has to be insulated from grounding out - so concertina can be electrified, but it would be a royal pain to do it.
easier to just run 2 straight electrified wires 12" apart so there isn't any slipping between them.