Burning down the ... fence?

Saturday (September 14), Laura heard some popping and crackling noises from the backyard. It turns out the fence was on fire! The neighbor on that side was soon there with a garden hose, and with a fire extinguisher and a garden hose of our own, we quickly put it out.
The charred fence.
  A slightly different angle.
  Shooting downhill
From the neighbors side
Laura using a real camera to take a picture.
The other neighbor, who first noticed the little conflagration