Cheeky pranksters shocked locals by swapping the flag of St Piran for the cross of St George in Perranporth.
The mystery anglophiles snuck on to Chapel Rock this morning and switched the flags before hastily returning the St Piran’s version to it’s rightful place.
Yet the swap was seen by Perranporth residents cleaning storm debris from the beach.
Tom Job, director and manager at the Watering Hole, said: “We were cleaning and we looked up and saw a St George flag rather than the usual St Piran one.
“We went back in to the bar and when we came out it had been switched back to the St Piran's one.”
It is not the first time that Chapel Rock has seen unusual activity.
In the past a Christmas tree and a piano have both been perched at top of the structure.
But no one has ever before interfered with the rock’s symbol of Cornishness.
The culprits have not been identified, but Mr Job thinks it might have been jokers wanting a quick picture.
He said: “Obviously we have nothing against the St George’s flag, but we definitely prefer the Cornish one up there!”