My 2-year old Samsung LCD monitor died on me a few weeks ago, and little did I know that this would lead me down the path of investigating an issue and looking through Firefox' HTML parser code. But that's what I did, and my experience simply reinforced my belief that HTML markup used on websites need to be validated.
I recently encountered another issue with scripts running on Internet Explorer. In this particular instance I was running IE6, which unfortunately is still a corporate standard where I work. I take comfort in knowing I'm not the only one that still uses this browser, but I long for the day when these older buggy and non-standard compliant browsers are no longer used or that their use has become so statistically insignificant that supporting them is simply not worth the effort.