I am an engineer. I can memorise email addresses, IP addresses, codes and patterns without a problem. I can tell you my first Switch card (remember them) number. I worked out how to decode barcodes when I was a teenager. I dial whole mobile numbers from memory. I use the phonetic alphabet.
But, for the love of Jebus, I haven't got the first bloody clue when people start quoting the bloody Porsche ISBN numbers. It must be hell in the Dog and Duck on a Friday night: "Oh, well I've got the new 987.1 which is miles better than the 983.1939.45 it replaced but nothing like the old 917.255.255.0 or the 992.992.992.992.992.992 Carerra dot RS dot Beetle dot replacement." Is it just that Porsche owners just look longingly at the back of Darren's Corsa with a selection of Halford's finest stick on letters on the bootlid and really just want a piece of that instead of worrying about whether or not a trip to the shops is going to ruin the resale value????
I'm going to have a cup of tea to calm down with a copy of the BT Phone Book.