Andrea conducted a poll at Axiom, and to a person none of us have experienced this or even heard of it. Our house gets hit quite often by lightening (which is awesome if you happen to be watching a scary movie at the time and then you see a blinding flash of light actually in the house! Creepy! And then you get the fun of running around and seeing what appliance you lost!) but we have never had the thump come up. Caveat could be that we live in God's country? Tom's away on a Top Secret Axiom Mission right now but I'll follow up with him when he gets back.