Spoken like a guy who hasn't had these kinds of clients (either you're lucky, or you're well hidden). :)

I have had so many of those situations, "I LOVE IT! Can we change this?" to the point of dropping the graphical side of web design as a for-hire skill. Most people don't know what they want, and they don't know what is the best way to accomplish goals. As a designer you need to have the ability to say I'm sorry, but you're wrong (hopefully in a tactful way), otherwise I guarantee you will wind up wondering where you put that loaded gun...