Which weapons count as legal vs. illegal? Are there special laws/considerations like if the gun is under the seat, it's considered a concealed weapon bla bla bla etc.?
Either know your laws, or pick something that isn't a weapon until it's used as such. In the right hands, a baseball bat, or crowbar, is just as dangerous as a knife. (Guns still win, but I wouldn't recommend it.....unless you live in VT, or one of a handful of other states with VERY liberal laws).