For anyone that doesn't know:

Thermite is simply iron rust and aluminum. A soda can packed with powdered rust (with a tablespoon of proper thermite powder to get it started) will blow completely through an aluminum engine block. The reaction is extremely energetic reaching temperatures above 2000K, and is nigh unstoppable. It is stable, safe to handle (unlit) and difficult to ignite requiring burning magnesium or similarly extremely hot source (cigarette lighter won't cut it) to get the ball rolling.

If anyone asks me what the craziest thing I know is, the fact that the ingredients for this stuff is literally everywhere and society still exists is the first thing that comes to mind.