Family tailor
I was wondering… how about a family tailor who is quite capable of distinguishing a glove from a sock, or, at least, who, instead of replying that neither you had noticed, is ashamed when you are obliged to come, over and over again, to make him correct the mistake? Like the client was paid to check the tailor’s note, written even under dictation.
Wouldn’t you finally pay his wage without puking?
No, wait, there is no such family tailor (whose wage someone is obliged to pay). Phew, what a relief!