 The first is simple. If impossible worlds can break some logical rule, then why can’t they break all of them? Suppose we fix on standard proof rules for the connectives. Each such rule is as closely tied to the meaning of the associated connective as the others are (to their associated connectives). Yet, as each logically impossible world breaks at least one of those rules, what’s to stop some other impossible world from breaking any of the other rules? This argument has some intuitive force, but is clearly far from conclusive.