Gardai are warning of the circulation of counterfeit Bank of Scotland £50 notes in Buncrana.
On Saturday, one man entered a takeaway in the town and paid for his food using the fake note, leaving the premises upon receiving his change.
Another man attempted to pass a counterfeit note but left immediately after staff failed to accept it.
Gardai are urging all business owners to be on alert, particularly ahead of the busy Christmas shopping season.
