Not because everything looks good and normal it means that they are okay. The illusion of normality is one of the worst traps you can fall in.
Not because your wife smile at you it means that everything is sweet and 'dandy' between you and her.
Not because everything is running smooth at your office it means that something chaotic can't happen. The reality is that in most cases there is always a problem present. You must always think ahead and don't relax. It is just the nature of human beings to always create some tension. You will always have problems everywhere you go. Don't fall under the illusion of normality. What is normal to one can be chaos to others.