You might remember not long ago there was a sort of Willy Wonka-style golden ticket hunt, involving new plastic fivers, engraved with tiny portraits of author Jane Austen.
Well, now two more fivers have turned up with cryptic messages engraved into them, sparking rumours of a new treasure hunt.
The latest mystery note was found by Richard Read, a bishop at the Mormon Church and self-professed collector of fivers - if anyone was going to find one, it was probably going to be him.
Credit: Richard Read
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Initially Mr Read thought he had bagged one of the super rare Jane Austin notes, which are worth a tidy £50,000. However, upon closer inspection he found instructions inscribed onto the clear plastic portion of the new bank note.
The message read simply: "Look for serial number AL22171910".
The Jane Austen fivers were put into circulation by micro-engraver Graham Short and included a portrait of the author, only visible under certain light, along with quotes from some of her most famous works.
But instead of a line from Pride and Prejudice, Read was faced with this bizarre message.
Credit: Richard Read
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And he's not alone.
Just last week Joy Timmins contacted The Sun Online to report a similar incident.
Joy's five-pound note bore the exact same message, leading her to believe that there could be a copycat engraver on the loose.
Both finds have got the rumour mill running overtime with speculation that there could be another similar treasure hunt taking place. Either that or someone is just getting up to some mischief.
Read said that he would be hanging onto the note to keep in his collection, adding that he thought the message may have been inserted into the note somehow, as opposed to having been engraved.
Micro-engraver Graham Short's representatives have denied that the newly found notes are anything to do with him this time, so where they've come from and what exactly they're all about remains to be seen.
Even so, we'd suggest keeping an eye on any fivers that pass through your hands from now on, just in case.
Featured Image Credit: Richard Read