Just looked an online video on YouTube that explains the power of mistakes.

 "People make mistakes in life all the time. It could be putting your shirt on backwards, mistaking a woman for a man or even kissing someone and then finding out that they are related to you. By taking these mistakes that happen in life and integrating them into commercials, you can create something that is both funny and memorable"

Can’t say there’s a direct tie in with Web Metrics and this video - but there is an indirect one - maybe we find things other than what we were searching for, or tracking.  I’ve seen that in some of my client work, and I’ve also found that’s true for painting.  I don’t cover up mistakes because I’m not sure anything really is a mistake (when I’m painting, that is); you can read more about art in ArtNewYorkCity.com, my art blog.