g1smd - 7:41 pm on Aug 5, 2011 (gmt 0)
Oh, wow! I just trotted out the usual "stuff to go check", and didn't actually notice who was asking the question. :)
I nearly messed up big time on the .htaccess file for a MediaWiki site a few months ago. I put two rules in the wrong order, missed a rule out and had a typo in one another. Good job I checked the site logs early the next day; averted a potential disaster. Google had only picked up 3 duff pages by that time. Even so, it took Google more than a month to undo the problem. Doesn't bear thinking about what would have happened if I hadn't looked back for several weeks - or months.