I imagine it all starts with a form the customer is to fill out.
What would you like written on the cake? (Please be exact) ______Nothing on it______
And the snarky emo-teen working the bakery counter thinks she's soooooo funny being so literal.
when i got married, we got our wedding date engraved on the inside of our wedding bands (for free!). we had to come in in person and write it down exactly and then have it read back to us because the jeweler had been burned so many times by people who wanted such weird shit. like, he put the wedding DATE on the inside of someone's rings and they were pissed because she'd asked for "our wedding day" and she meant, like, "Saturday."