I remember the time the senior IT person from our parent company used scripts to copy the registry from the AD primary server to all the secondary ones (so they all had exactly the same registry). Once he realised his mistake, his solution? - reboot them all! It was a Friday morning so our network was down all day, and it took us local IT people all weekend to fix it up. Expecting to get a "thank-you for working all weekend" from the IT manager of the parent company, all we got was a "Why did it take you so long to fix up our error?". And the person who made the error? - he's now a senior manager!