How one Brit used ChatGPT to dine free at McDonald’s for months

By Brandon Lee

one Brit used ChatGPT to dine free at McDonald’s for months

I’ll admit, the sight of survey slips piling up beside the kiosk at my local McDonald’s always seemed innocent enough—until I learned of a clever hack that turned those little receipts into free meals. Here’s how a resourceful Brit gamed the system using ChatGPT, eating burgers at no cost for nearly a year.

ChatGPT foots your bill at McDonald’s

ChatGPT, the AI-powered chatbot from OpenAI, is usually celebrated for drafting everything from code in Python to heartfelt birthday messages. As OpenAI puts it, “ChatGPT is designed to assist users with creative and technical writing tasks across a variety of topics.” Yet one customer discovered it could also compose scathing reviews that translated into promo vouchers for Big Macs.

According to McDonald’s UK, each survey code on their receipts is intended for genuine feedback only. However, the system will automatically email you compensation if you report a “very poor” experience—whether it’s real or not.

ChatGPT

A deceptively simple trick

The secret lay in the chain of prompts and copy-pastes. Our ingenious diner collected the satisfaction survey codes printed at the bottom of every receipt. He then asked ChatGPT to craft a 200-word complaint about receiving a soggy sandwich—his “complaint prompt” simply needed to be under 12,000 characters.

“I was shocked to find my burger drenched in sauce, buns falling apart and fries stone-cold,”

ChatGPT dutifully generated dozens of unique, eloquently scathing reviews. A quick paste into McDonald’s feedback form and voilà: an email arrived offering one or more free items as compensation. When one review wasn’t spicy enough, a follow-up prompt to tweak the tone did the trick.

The scheme unravels after nearly a year

It wasn’t until almost twelve months later that the branch manager noticed the alarmingly low customer-satisfaction ratings and several repeat offenders. Posters urging customers to “share positive feedback” even went up above the tills. Meanwhile, our protagonist let the cat out of his bag on his popular podcast, explaining every step of his satisfaction survey subterfuge.

Naturally, this loophole raised eyebrows beyond the Golden Arches. Citizens Advice reminds us that falsifying reviews can breach the Fraud Act 2006, with penalties including fines or imprisonment. As one spokesperson warned, “Misusing digital platforms for personal gain can carry serious legal consequences.”


Next time you find a feedback code at the bottom of your McDonald’s receipt, you might just think twice about what “very poor” really means—and whether you fancy a free burger at the cost of a little honesty.

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