English police are probing fake notes - which locals believe have come from Scotland because they are marked 'twenty poond'.
Cops have released pictures of what has been called 'the worst attempt at a forgery ever'.
The note has reportedly been used throughout Cornwall, and shopkeepers, takeaway owners and bar staff have been urged to look out for them.
And the spelling on the 'poonds' has led many to believe they were made north of the border.
Bodmin Police issued a warning on its Facebook page. A spokesperson said: "We have been made aware of some counterfeit currency circulating around the town, particularly in the town centre.
"We've received reports of individuals using or attempting to use these 'Twenty Poond' notes in shops and takeaways.
"As you can see from the attached photos, these notes are clearly fake.
"They are all exactly the same, with the same serial number and wording identifying it as 'toy' money. I'll also attach a link to Action Fraud on what to do if you fall victim to this scam.
"We ask shopkeepers to remain vigilant when accepting notes."
Some local residents in Cornwall confirmed they had seen them and warned a similar looking £5 note was also being circulated.
But others joked that it could have been a legitimate Scottish note.
Gary Button wrote on Facebook: "Twenty poonds? Maybe it's Scottish money."
David Robinson added: "I thought Scottish notes were legal tender."
