Actually the microwave's cavity magnetron is tuned to one of the vibrational frequencies of a water molecule. But it will cause nasty arcing when metal is present - I once made the mistake of trying to heat water in a coffee mug with metalic trim. Looked like the 4th of July in there. :eek...
Joe, I was just thinkin'....... Besides which, we need to start planning the entertainment for the next Scooterpalooza, which if I understand correctly will be held in wild west Wyoming. :laugh: They could even film the documentary: "Brokeback Microwave".
You can always get cheap scuzzy microwaves that still work on craigslist for about $25. I'll bet a 12 gauge shotgun shell would be best: there's an insulating gap between the base of the shell and the pellets - a perfect setup for arcing - with the powder charge between them.
It goes the other direction too. You can have supercooled water which instantly turns into ice upon shaking. I've seen this here in Boise: put a plastic water bottle onto the patio table over a freezing night. In the morning, the water in the bottle will still be liquid until you pick it up. It...