I can really dig a bike shop that is unbusinesslike.
I asked the man if I he had an allen bolt to fit my seat tube clamp, because mine (lightweight junk and impatient owner) had been totally chewed. He could have said, "No, but for $10 we have a whole set, bolt and clamp."
He said, "Here," and handed me a box of nuts, bolts, screws and "thingys". I picked out three possibles. One fit perfectly, saving me a sawbuck.
I walked by there Friday to say "thanks," and he was outside the front door.
"Thanks," I said, for which he slapped my arm and went inside.
Oh, by the way, it was "No Charge."