http://www.homedepot.ca/product/side-strike-chisel/953832#BVRRWidgetID
http://www.bahco.com/english/products/wrecking_knife.html

I'm noticing quite a few variations of the side strike / wrecking / demolition chisels these days. Sharpened on two sides and built like a tank. Looked closely at the Dewalt version in Home Depot for $15 -- you'd have to work pretty hard to break it, whether beating it with a hammer or prying with it. Could be useful in a BOB/GHB or as a loaner to people who trash good knives. I might just buy one to play with.

[Tried to link an image for you but the newfangled tablet isn't cooperating, dang it.]