Here's a great story of a 72 year old woman using her wits and a can of air freshener to fend off an assailant. Great instincts!
Since you're reading this blog I'm taking a wild guess you're at your computer. Or maybe you're on the go reading this on your iPhone or other mobile device (and hopefully you're not driving). Right now pause. Look around. What is within arm's reach that can be used as a weapon?
Did you pause and look? Do it.
Next step: reach out and pick it up. How does it feel in your hand? What can you do with it? For example, I'm looking at my cordless landline phone. I can easily wrap my hand around it and use it as a hammer to the face (or side of the head or solar plexus or other soft target). Or the loose-leaf binder can be thrust into a throat.
Do this exercise every so often. You'll be better prepared. Just in case.