I had a thought last night, and sought advice from one of my professors here at the school. He is a geophysicist by training, and as such knows far, far more than I about such things.
The thought was this:
Would a microwave oven make a rough-and-ready Faraday cage? The thinking is, if it is designed to contain high-frequency energy, then surely it will repel the same, which includes EMP from tactical nuclear explosions.
I asked Grant, my professor, and he said yes. It would repel the higher-freq stuff, which is what does the damage to electronics, but not the low-freq, which is irrelevant. He then wondered why he hadn't thought of that.