Here is one now. Anything can be a weapon. An object is not a weapon until it used as one. You are allowed to use any weapons at your disposal should an object need to become one. But, before that, guns, axes, bats, etc, are outlawed because they are unsafe to have around in the same way that certain renovations are illegal. It just so happens that when a weapon is needed certain objects are unavailable. You can use any kind of household ornament as a weapon though, and at any time no matter what.