“It’s pimty tare in this house,” said Fran Taylor, on seeing the bunting hanging in her living room for her four-year-old son’s birthday.

The banner, from B&M, was meant to say ‘Party Time’ – but the letters got seriously muddled up in production.

After spending a good 15 minutes in hysterics, Taylor took to Facebook to have a short and sweet rant.

“Thanks for nothing B&M Stores, you big pile of useless cheap shite,” she wrote. “At least he’s only four tomorrow so he won’t realise.” 

[Read More: Baby’s first birthday party – ask yourself, parents, who’s it really for?]

Taylor, who runs the blog Whinge Whinge Wine, told HuffPost UK her husband and their five-year-old daughter picked up the banner from B&M on Saturday.

Once the children were in bed, Taylor’s husband put the bunting up in the living room – but was shocked to see the rather obvious spelling mistake.

“He came upstairs and asked me whether I was ready to pimty,” Taylor said. “A bit confused, I came down to the front room and didn’t stop laughing for a good 15 minutes.”

She took a photo of the epic fail and shared it on her Facebook page to her 17,000 followers (who also found it hilarious). One person commented: “Am laughing uncontrollably at this. Thank you.”

And another added: “I honestly thought this was some sort of Welsh word for birthday party!”

“I can’t quite understand why it’s so funny,” Taylor said, “but it’s now become a family tradition and no, I won’t be rethreading it. Who wants a boring party when you can have a pimty?”

Taylor left the banner up for the birthday party with relatives, who found it just as brilliant as she did. As for her son… “He obviously can’t read but his older sister delighted in telling him,” she said. “I’m not sure he quite understood.”

B&M contacted the mum-of-two to say they’re sending her son an apology birthday present.