Sometimes you have one of those REALLY odd requests... Today I was asked to fix a problem with a web link. A quick look showed that the DNS entry had been removed but no one could remember when it was done or how far back......
A quick hunt around the change recording system had no mention of it so this meant the change occurred OVER 2 years ago.
Further digging revealed that this particular system hadn't actually been accessed since something like March 2005 and that some managers thought the problem was down to an intranet 'look and feel' change which months after the system was last accessed.
This actually means it was almost TWO YEARS before they raised the call since then most of the people that worked on the system have left the company.
It's a bizarre world in IT sometimes.