Never underestimate the power of HUMOR or its application. Here are 100 funny 404 pages, the pages users get when something has gone wrong. The ability to turn a page that is FRUSTRATING into a funny gambit is the difference between a site that makes a few bucks and one that is worth millions.
Design for engagement means thinking about the customer at all times. Thinking about the customer means BEING the customer and not the Master Blaster Controler. Have fun and design fun in especially where its a surprise and you WIN.