Client: The demo you created is too small. Make it wider.
Me: Is your monitor very large? I optimized it to be around 1024px wide for a variety of monitors.
Client: No, no, it has to fill the screen up. Let me tell you the correct dimensions.
A few moments later.
Client: Make it 20 inches. The perfect width is 20 inches to fill the browser window.
Me: Did you just use a ruler?