The Duke of Edinburgh is known for his punchy one-liners and cracking jokes with well-wishers on public outings.
But one man stood out from the crowd at Sandringham on New Year's Eve and was made the butt of a joke after Prince Philip spotted his long beard.
The man, who was joined by his partner and young daughter, was stood near the entrance of Sandringham House.
At 11am, Prince Philip and Princess Anne emerged and walked a few hundred yards towards St Mary Magdalene church.
As many people in the crowds were applauding and wishing them both a happy New Year, the Duke of Edinburgh was drawn to the bearded man.
He pointed at the white man and jokingly asked a royal bodyguard: 'Is that a terrorist?'
The bearded man, who left Sandringham with his family before he could be identified, overheard the comment and laughed.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here