I had a client that submitted a very detailed mock up of what they wanted the site to look like. Each page was meticulously laid out with precisely what they wanted. Given so detailed a model, I tried to change as little as possible.
Two weeks after I finish the site (I've heard nothing from them since I submitted the site for approval), I get called into a meeting with the client and my immediate supervisor.
Client: "I don't really like the way the site looks; I was hoping that you would go in a different direction that what we sent you..."