I would think that a crossbow would be a rather dangerous device to carry around loaded, given that such a tremendous amount of tension is held in the bowstring. If that string ever broke, or if one of the bow beams ever broke, the crossbow could do quite a bit of damage to its holder. I don't know; I've never played with a crossbow before. Anybody care to comment on this?
As far as the numb-chucks are concerned (I can't spell it, so why try?), we have that wonderful late-'70's and early-'80's obsession with Bruce Lee to thank for the strict ban on nunchukau (did I spell it right then?). (I actually did some research on the legislative intent on this ban a couple years ago for a law school class!) It seems that several of the California-based street gang members started fancying themselves as martial arts gurus. You can still see in some of the old 1980's movies, when the toughest of the street thugs comes around the corner, he stops and spins the 'chucks for a moment. (No kidding! This was apparently a real problem in California. People were getting their heads beaten in by idiot kids toting numb-chucks.) Anyway, nunchaku (I think this one's spelled right) got to be a symbol-weapon of the California gangs. California banned them, and the rest of the country quickly followed suit.