Prince Charles and Camilla Parker Bowles were caught acting like naughty schoolchildren on their recent tour of Canada.

Footage has emerged of the royal couple secretly giggling while watching an Inuit throat singing performance.

Inuit throat singing, or Katajjaq, is a form of musical performance uniquely found among the Inuit. (An analogous form called rekuhkara was once practiced among the Ainu of Hokkaidō, Japan.) The Inuit performers are traditionally women who sing only duets in a kind of entertaining contest to see who can outlast the other, although one of the genre’s most famous performers.