I needed a headlight blub for the car so I pop into the nearest car shop (Motaman in Bristol) and ask for "A bog standard H4 headlight bulb". Spotty yoof behind the counter counters with "What car is it for?". "It doesn't matter" does not seem to be proframmed into his list of acceptable responses so I have to tell him so he can look it up in his little book and pick one up from the shelf right beside him, look at it quizzically then carefully select another apparently identical H4 blub.
Wanders off shaking head.