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Mum-of-three Stacey Brown was reading 'The Smartest Giant in Town' by Julia Donaldson - who also wrote the hugely popular 'Gruffalo' books - and illustrated by Alex Scheffler.
When reading the story to her children at bedtime just like every other night, she noticed the peculiar detail, the Manchester Evening News reports.
The picture in question might be an innocent coincidence - it shows the eponymous giant George hopping down a road with one of his shoes missing. Stacey thought the sock looked like a penis and the post went viral on Facebook shortly after she posted.
She added: "Trying to muffle the giggles as I read on".
The post was filled with hilarious comments as many parents agreed George's giant sock looked like a very different body part.
"Omg!!!! Penis Foot!!! I used to read this book to my kids," one woman joked.
Another mum said: "I can't unsee that now! Ever!"
A third mum said her child already saw the similarity. "OMG my son always said it's his willy," she said.
She wasn't the only one who said they wouldn't be able to look at the book the same way again. "Omg!! No way this was one of my children's favourite I never noticed this," a third parent shared.
Although some commenters were not convinced, with one Facebook user suggesting: "You people have been in lockdown too long. It looks like a sock to me."
Someone else responded to this comment, adding: "To me too".
Bedtime storytime for Stacey and her children will never be the same. She told the Manchester Evening News that she was 'hugely surprised' by the popularity of her post.
"I thought it was just me and my dirty mind. I'm so glad it raised a lot of laughter though.
"People will never look at it the same again."
You can say that again!
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