@Terrificli -- That is exactly right. I live in one of those neighborhoods with a lot of magnetite in the bedrock. We had to have a couple of pine trees cut down because they had been struck by lightning several times and were dying.
The problem was the trees were huge and over 100 years old. Had they died and started to decay, our home could have been crushed by huge, falling limbs or (perhaps) a giant tree falling over on it.
Scary stuff, but I'm told it is not uncommon to have trees get in that bad a shape due to lightning strikes.