The term "crazy zone" is to be used primarily to distinguish between people who are genuinely crazy, i.e., those from whom crazy behavior is to be expected, and people who are not crazy and yet who occasionally indulge in the crazy. Thus it is permissible, but not recommended during the course of a domestic argument's escalation, to point out that a spouse has slipped into the crazy zone, and for no apparent reason. This is preferable to stating simply that one's spouse is crazy, which observation ascribes a much more serious, pervasive and irreversible condition.
Visits to the crazy zone may be mercifully fleeting, if recognized by the visitor, or they may vary between several minutes to a couple of hours. Although generally harmless, such visits may lead to an Argument Hangover, q.v.