I didn't cut a car in half once...I figured it might make the edge a little dull. So I refrained. Everything else is fair game, though.
Seriously though...
About the only thing I don't do with mine is try to drive them tip first through a concrete block or baton through frozen wood, or whack the spine with a hammer, or drive it through a piece of lead pipe.
I've batoned my RC5 through knots, uneven grain, warped wood, and wet wood. It never made the first bobble or got dull. I pried a stuck door open with it once because it was all I had handy (the crowbar was in the building!), it's not something I want to do everyday or on a routine basis...but it took it.
If I had an old junk car I'd flip it upside down (before getting in), strap myself in, tie one arm behind my back, roll up the windows and see if I could use JUST my RC5 to get out.
I think I've been watching too much Bear Grylls...
I 'rassled a bear with it one time at band camp, 'cause the bear stole my flute. Ever seen a bear's "oh shit!" face? I have.
