I can think of several:

*Baseball bat in the hands of a good stick man.
*A Sig-Sauer 9mm handgun is my personal fave.
*OC spray is also a good bet since it's hard to fight someone you can't see!
*Running from someone wishing to use weapons instead of a good "old-fashioned" fist fight is also noteworthy.

Those are just a few of my favorites!