Well I'm still grieving here this morning

Although I can see there may be a point in time I can give a good hearty laugh about it. Just not yet.
I have never tried to chop or split wood with a knife before (and never again!) but the beefieness of the Nighthawk 'inspired' me. Imagine my surprise

As jb said, just like a kid on Christmas who broke their favorite toy before Christmas dinner.
Nice point on the serrations yoda. It broke crisply at the first serration in front of the guard. The 650 (without serrations) would probably be stronger, although if I refrain from splitting wood either one should be fine.
The wood I was laying into was red maple which is a soft maple. And the temperatures here were in the 40's so not cold enough to make the steel brittle.
About the warranty... I sent Joe an honest email about what happened and refered him to this thread for pics. If he feels it's not something to be covered under warranty, I'm fine with that. I've already convinced Mrs Messy that I was stupid (that didn't take much convincing) and that I should go get another one (that was a much tougher sell!).