Love those shops.
There's a tool shop near my old work like that, never known to fail, and would sell (or usually give) you just one screw if you needed it.
But if you wanted something, the game was that you had to spend an hour trying to think of absolutely every possible variable, so you could ask for the exact thing (male, left-hand, high speed, inverted, etc.)
... and they would ALWAYS smile sweetly and trump you with something like "Brass or chrome?"
