Over on Boing Boing Gadgets, our Rob's spotted this umbrella with a set of brass knucks on the handle:
Umbuster is part umbrella, part knuckleduster Discuss this on Boing Boing Gadgets
It used to be that a gentleman could arm himself with a sword cane, ready to whip his blade out at the first sign of unseemliness. Since parliament has banned anything that may be sharpened to a point, defense of oneself has become a more subtle skill.
Some gentlemen learn the unarmed arts, but in the face of villainy, stronger means are occasionally required. Hence the Umbuster, an umbrella combined with knuckledusters.