Even a little utility pole transformer can put on quite the show. Years ago, I saw one where the the transformer itself got ~vaporized. And then the arc started walking down the pole. Maybe the pole was old enough that it had some long cracks, that were damp enough to conduct well. Pretty soon, the entire pole was carbonized, and there was arcing all the way from the kV lines to the ground.

After a couple hours, they isolated the circuit, and shut it down.