Do you know what the single most vulnerable spot on a person's body is? The spot people will drop everything and anything they are doing to protect? The spot even people jacked up on mind altering drugs or illegal steroids will do everything in their power to cover?

It's the eyes.

The eye ball is the single most vulnerable spot on the human body.

In fact, if you can jab a person's eye -- and I don't care how ripped up with muscle he is or how "tough" he thinks he is -- you will cause him a lot of pain. Sometimes immense pain.

It's true.

And we're all born with a natural instinct to protect our eyes at all costs. Whether it be from a small speck of dust...or a protruding finger in the middle of a vicious street fight.

That's why, if someone ever attacks you on the street, one of the first things you should do -- before messing around with complicated martial arts kicks and punches -- is simply jab one or both of his eyes.

At best, you'll connect and cause him enough pain to forget all about attacking you. At the very least, you'll cause him to slow down and protect himself, giving you a chance to either escape or go in for an attack of your own.

I realize poking someone's eye isn't the most sexy martial arts move in the world, but it works like gangbusters and can keep you alive and in one piece if some lunatic attacks you on the street.