Emma McDonald, owner and operator of Oh Cakes near Invercargill, New Zealand, was contracted to produce a cake for an engagement party by the bride-to-be's sister.
The customer had $30 (~$25) left on a $50 (~$40) voucher after buying something else, and she asked McDonald to bake her a chocolate cake for the party.
The transaction rubbed McDonald the wrong way, according to a message she later posted on Facebook: "Your [sic] left with a $30 voucher and you want a cake still?? ok cool - give me some ideas?? oh wait you have none apart from wanting chocolate. I have a brilliant idea for your cake!!! - so here it is, your turd cake! Hope you learn your lesson."
The unnamed customer, who was understably shocked to discover the surprise awaiting her and 100 guests inside the "magnificently wrapped" cake box, responded to McDonald's post with her own status update: "We r just at my sister's engagement and got your cake, we and every1 else is absolutely disgusted."
"I feel she got what she deserved," she continued. "I don't make cakes as a business. It is just a hobby and I'm taking it all with good humour."
The incident incited such ire among locals that Invercargill's mayor Tim Shadbolt was moved to respond. "I think this must have been done with humour," he told the paper, "but sometimes humour can go terribly wrong."
Not in McDonald case: It seems she'll be getting the last laugh.