The Pen Is Mighty

In Krav Maga, you use your bodily weapons (punches, kicks, elbows, knees...). You're also expected to improvise weapons by using whatever comes to hand--my favorite recent suggestion was your cellphone.

In Martial Artists, MobiusStrip linked to this brutal account of a street confrontation.

Read the fourth paragraph. (Yeah, it's gross; this stuff is gross. It's also very funny within the sobering context.)

Note the item that came to hand.