Prince Charles thought he had spilt some curry down his crisp white shirt - thanks to a joke from his wife Camilla.
The Prince had lifted up a spoon of rogan josh curry to smell the rich aroma when the Duchess of Cornwall fooled him into thinking he had ruined his attire.
The Prince of Wales, who was wearing a pebble-coloured suit, quickly realised Camilla was having him on.
The Duchess made the joke at a farmers' market in Penzance on the first day of a three-day tour of Devon and Cornwall.
June Hornby, owner of Ruby June's Indian Kitchen, who was running one of the stalls at the farmers' market said: "The Prince lifted the spoon up and had a sniff of the rogan josh.
"Camilla made a joke that he had dropped some on his shirt and he went 'oh' and looked, but Camilla had had a little joke."
During the stop in Penzance, Prince Charles officially reopened the Jubilee Pool.
The lido suffered damage during the winter storms of February 2014 and was closed for the subsequent two summers, before it re-opened to swimmers in May.
The Prince of Wales was greeted by two women in union flag swimsuits.