Great thread Keith!
My dad has one of this:
Sardinian "pattada" knife, available in several sizes, used to cut sheeps and pigs throat.
You definitely cannot walk around with this, although all sheperds have this.
I have a leatherman at home and some similar knives.
I plan to get a real Swiss army knife -they are quite cheap where I work.
used to have several knives of different sizes, but go rid of them once I moved to Uk.
A friend of mine purchased a nice set of knives made of a plastic material (possibky Kevlar?), that cut like hell and are not seen by metal detectors.
I had several bayonets.
two German ones from WWII, one from WWI, but the nicest one was a kalashnikov bayonet that was a real work of art:
In Italy you can carry around a pocket knife if it is maximum 3 fingers of length.
Thing is even with such a site, if you get into troubles with the cops, even if you don't use it, you may be accused of carrying an improper weapon.
here in Switzerland I ithink is different, everybody has an army knife, you can buy them also in supermarkets:
http://www.victorinox.com/ch