My n900's display/touch screen is completely inoperable and I am unable to get even the USB working. So USB, bluetooth and commandline are all out.

Is there a button I can press to hard reset it or some hardware I can take out to get rid of the personal data?

If not what is the best way to physically destroy the phone? I don't have a firearm or any special equipment. Should I just dunk it in water and run it over with a car a few times? Then I can distribute the small parts among 8-10 different spots/dumpsters/water bodies.