In Which Raccoons Are Deterred but Not Educated

After the latest pond carnage, I decided to build me an electric fence to keep the furry bandits out.
Now most electric fences use a single wire system where the circuit is completed by the animal bridging the hot wire to the ground (literal ground, as in dirt). This works well in moist fields, but in arid climates or during a hot summer, the ground has trouble carrying the current from the animal foot back to the fence energizer, disabling the electric part of the fence. An alternative is the two-wire system, where one wire is hot (+400V or more) and one is "ground" (0V) and the animal is shocked when it bridges the two wires.
Obviously, this system doesn't work if the animal only touches one wire, but I really didn't want to drive three 6' grounding rods into the middle of my lawn and keep the dry, sun parched ground wet.
Luckily we already had an outlet at the pond for the fountain, so all I had to do was plug in the energizer and wire up the fence. Initially, I used some thin pieces of plywood leftover from the basement floor as a temporary fix and it actually worked!

Take that!

Later, I used proper fence stakes to hold the wire and it seemed to still work:

Unfortunately, I didn't do a very good job when I moved the wire from the plywood to the garden stakes so the wire was not very taut and the bottom wire was quite high above the ground, allowing an enterprising individual to crawl under the bottom wire and avoid a shock:

After I saw that video, I went out and spent an hour rewiring the fence and this is the result:

Vaguely fish-concentration camp esque...