Re: The customer is always right....
Firing customers who are a more of a pain in the ass than they are worth is one of the truly great joys of being self employed.
About three times per year, or thereabouts, I quite literally use the phrase "you're fired" to a client of mine, or of the wife. Frankly, I quite enjoy it. The look on their face when they realize I am dead serious is priceless.
 She's a softy, so I draw this detail by default.