The next time a doctor writes you an illegible prescription, laugh in their face. “That simply won’t do,” you’ll chuckle, ripping the prescription in half. “Try it again, or I’ll take my business elsewhere.” I think they’ll get the message.
In Heian Japan, it happened all the time. One might decide to marry a woman, and eagerly anticipate a love poem from her in reply only to see….her wretched calligraphy. The wedding was off!