Someone is a fan of
The Deadliest Warrior 
I am. They regularly surprise and delight me with how abysmally fucking stupid humanity can be.
Although -- question about modern armor (you know kevlar and shit). Isn't a lot of it pretty...specific? Designed to handle very specific impact profiles?
I mean, a longbow used to punch through steel. How's it rate against a kevlar vest designed to stop a smaller projectile?
Kevlar is designed to dissipate large amounts of energy by decelerating and fragmenting the bullet before it strikes flesh effectively by folding around and entrapping the projectile enough to incur a large loss in velocity due to friction, and spreading the remainder across a wider area. It does fairly well against stabbing, less well against anything that cuts because it compromises the fibres. Most every type of armor that isn't plate is also built on this principle.
A longbow won't penetrate a plate, ever. It's unlikely to penetrate mail beyond a few dozen feet. Likewise for layered leather, or cloth of sufficient strength and thickness. Weak points in the armor is the only place where an arrow will actually strike a killing blow.
This neckbeard has some pretty cool testing, and a fucking wicked poleaxe/hammer. His conclusion seems to be that ten layers of cotton makes you immune to bodkin arrows (like a flight or target arrow - not designed for cutting).
Most ballistic body armor is also very effective against slashes from blades, not as effective against stabbing attacks (but still far better than street clothes or even heavy leather). A arrow from a modern compound bow (more kinetic energy than classic longbows) has a similar impact profile to a high-power pistol round, and I doubt it would penetrate much better (but I'm guessing).
--Dave
It's the other way around: most vest will foil a stab, but slice open easily enough. It's completely counter-intuitive, I know.
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