When TV freelancer Chris Dodd allegedly spotted this poster in a Sainsbury's window, he decided to let the supermarket know on Twitter.
.@sainsburys not sure this is supposed to be in your window...
The poster talks of a "Fifty pence challenge" designed to encourage customers to spend an extra 50p every time they shop between now and the end of the year.
A guy called Ross, who was apparently running Sainsbury's official Twitter feed at the time, responded and asked to know which store was showing the poster.
@mynameischrisd Yeah, I don't think so either. Which store was this? I'll give them a call. Ross.
But Dodd had other ideas and thought the British public should know about the supermarket's plans.
@sainsburys oh I'm not sure about that Ross... I kinda like that they're giving folks a heads up!
At this point Ross started getting rather desperate for information...
@mynameischrisd Understood. I'd really appreciate you letting me know which store though. Ross.
@sainsburys how are staff supposed to encourage the extra 50p spend? #50pChallenge
Ross went on to acknowledge the poster was meant for "staff areas" and not for the public to see.
@mynameischrisd This is clearly a poster meant for staff areas. I'd really like to make sure it gets to where it should be. Ross.
@glitteringheels oh Sainsbury's are not playing nice. :(
Now, now – play nice, Ross.
BuzzFeed News has reached out to Sainsbury's for comment on the tweets and the existence of the 50p challenge.
Dodd has now revealed to BuzzFeed News that he spotted the poster at the Sainsbury's on Romford Road in Stratford, east London. So there you go, Ross, you now have your answer.
Sainsbury's eventually released the following statement: "We often use posters to make store targets fun and achievable for our colleagues.
"They are intended for colleague areas in the store, but this one was mistakenly put on public display."