I'm not even so sure grounding in the normal sense makes any difference. Now of course the charge is seeking ground, but when you are dealing with an electrical pressure of 10^7 volts, what constitutes 'insulated' and 'grounded' is certainly very different than it is for the voltages with which we are familiar. You would have to check resistances in the 10's of megohms to see what constitues a conductor or insulator. Even then most materials undergo some sort of breakdown (ionization, carbonization) at those pressures so the resistance would change if actually struck by lightning.

I just stay indoors or sit in my faraday cage

Jimbo