How to screw up an iPhone 3G?

I have an iPhone 3G I want to screw, not the whole phone itself, but the motherboard and what do. Please do not ask me why. If anyone has an idea on how please share. I would like to "F" it up so it does not light. – Yes, I am asking this question for reasons of warranty and Apple Care warranty plan does not cover damage caused by accidents and so on, to stick it in water will not work. – I was also thinking about making some sort of electrical damage, but how, I want to use a power sufficient to kill the phone, but not me, anyone have any ideas? LOL I do not stick an iPhone 3G in a microwave is safe, the iPhone is one of those electronic devices that have the rechargeable battery in it so that it can not be removed. I am sure that a battery in a microwave is dangerous even if you are a couple of meters away.

With this question, I suppose you want to destroy the iPhone for security purposes, if I dishonest, I'd probably apply a large voltage, or to pin on each side of the dock connector or to all contacts the headphone jack and all the pins in the dock connector. It would probably burn up the phone without any visible (you'll need to take care ensure there is no spark or burn marks)

Repair 3: replace AR.Drone mainboard