Managed to break this 2" chisel I was using to chop the mortises on my workhorse. I think I probably created a stress fracture in the plastic when I was bashing it with a hammer. Then I was hitting it really hard with a wood club, and the fracture broke all the way through. What appeared to be a solid steel tang going all the way through the handle is actually two parts, the junction of which is where the handle broke.
I took it back to Ace Hardware and they gave me a new one. I'll have to be a bit more gentle with this one.