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Being a gadget freak, I have alot of unusual stuff lying around, some useful, some just weird.
Two things that I have recently acquired I think would come in useful in a pinch-

1. Cold Steel's new "SHARKEY" it looks like a regular Sharpie Black Permeanent marker, but wait--it is a disguised Yawara Stick. It is made of Grivory, a glass-reinforced plastic. The entire pen is made for bashing--the cap will not pop off like a reg sharpie, so you can bang away--it is easy on the pocketbook too only $6. Stick one in your shirt pocket today.
http://www.coldsteel.com

2. The Self-Defense Pencil. I was given this by a dear, dear friend who works for Uncle Sam but not officially. It looks like a regular drafting pencil, but push the button on top and out springs a 3.5" stainless steel rod ground to a fine syringe point. Simple, yet very deadly. I carry it everyday--in a shirt pocket or somplace else handy.
Versions of this are available I think in the US, look in SOF magazine.