Once, while chatting to an IBM engineer while we desperately tried to figure out why a System/36 point-blank refused to talk to the outside world, he related to me the tale of the oddest callout he ever went to.
While the customer had provided the IBM feature code for the faulty machine, they could not identify it on their systems. He got sent out anyway. To a butcher's shop.
The feature code was absolutely correct but as IBM had not manufactured bacon slicers for many years it was no longer in the system(!) To cap it all, on being told that they no longer did that sort of thing the customer produced the extended warranty that he'd been religiously renewing every year, as had his father before him(!!)
I now wonder if it had that logo on it.
 Apparently inflation and decimalisation had not been kind to the premium charged.