While kitchen gadgets with numerous attachments and settings may leave you stumped, most of us are probably certain we know our way around the humble cheese grater.
But Twitter user Bea Symons from Nottingham shared a video produced by the food blog menuserved, showing how a grater should be used horizontally rather than upright and admits she "feels like a fool" for not realising this before.
According to the Daily Mail, her tweet captured the attention of other foodies who were equally shocked to learn that they've been using the simple item of kitchen equipment incorrectly.
Even Coronation Street star Lucy Fallon tweeted that she was in disbelief a the revelation, saying: "No actual way".
Bea's tweet has now been liked 60,000 times and shared 19,000 times, proving she was by no means alone in her confusion.
The video from MenuServed shows a cook holding a cheese grater horizontally with the holes facing up.
They then grate the cheese back and forth and the pieces collect inside, before they're tipped easily into a bowl.
After watching the video, one woman admitted she'd tried the method while making dinner and found that it was in fact much easier.
Another added that it's strange how people use graters vertically when it "makes sense to do it like the video".
Another said she now realised why the cheese always gets stuck in the grater when she's preparing food.
Others said they wish they had realised sooner and saved themselves a lifetime of the pain of accidentally grating their knuckles.
However, others were cynical about the idea and asked why some graters have rubber grips on the bottom so you can stand them upright, while another commented that it's more efficient to just grate cheese straight into the bowl.