i thought half of lightning came from the ground, like half the potential. Slow mo lightning strikes have them meeting in the center in the air, rather than striking from cloud to ground. I could be wrong.

Lightning hit an antenna that was disconnected but near a radio and blew up the radio, the PC it was connected to, and then everything connected to the switch that was connected to the PC via cat5, and just for good measure, everything connected to an outlet on that side of the house within 15' of the computer outlet. once it gets in, it doesn't matter if stuff is off or on or whatever.