So when she was taught to use a self-service scanner today, she only had one question on her mind: could it be tricked?
The supermarket is celebrating its 150th anniversary, and to mark the occasion, the Queen visited a pop-up exhibition showcasing the supermarket throughout the decades, which included the first Sainsbury's store which opened in London 1869.
Kate Middleton may be no stranger to the grocery store, but Queen Elizabeth doesn't exactly spend her weekends cutting coupons and meal prepping.
The Queen was pictured popping into Sainsbury's on Wednesday - but she wasn't doing her weekly shop.
The Queen then, smirking, hilariously butted in at one point and asked: "You can't trick it then? You can't cheat then?" she asked, according to the publication.
The checkout wasn't the only technology to catch the attention of the Queen, she found payments via phones to be "an interesting tool".
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Inside the basket was an old food product called "Bloater Paste" from the 1950s - a fish herring paté - which the Queen said "sounded disgusting" and "ghastly". You can't cheat?' said the shopper.
"Well, you can always cheat but with the weighted scales we've got, that should prevent certain items from being undetected".
She was told that shoppers enjoy the speed and convenience of the checkouts and replied: 'I'm sure they do.
During the Queen's guided tour of the store, Her Majesty showed-off her humorous side following a demonstration of a self-service supermarket till and its weighing scale system. "Everybody wants to hurry", she added.
However the Queen gamely joked around with staff, asking them if it was possible to cheat the machine. The shop is created to look just like the supermarket's first branch, which opened its doors on Drury Lane in 1869.