Prince Charles and Camilla, Duchess of Cornwall, were in Iqaluit, Canada, last week.
The city is the capital of Canada's Northernmost territory and is known for a large Inuit population (around 59 per cent at the 2016 census).
While they were there, they observed some Inuit throat singing.
CBC News explained the tradition as follows:
A performance and type of contest where two women [or] girls face each other and make sounds to imitate animals or their surroundings.
Whoever laughs first, loses.
Camilla and Charles certainly lost.
Some thought it was pretty rude of them to laugh at a tradition:
Others seemed to like them more for it:
A commenter wrote:
Look it up. It's a competition, whoever laughs or runs out of breath loses.
It's common for a performance to be done for visiting dignitaries and special occasions and people always laugh, if it wasn't okay to laugh they wouldn't keep doing it.
Indeed, Canadian Prime Minister Justin Trudeau smiled through songs performed for his swearing-in ceremony.
However, he did not openly laugh.
The royal visit coincides with Canada's 150th birthday as a nation.
It began on 21 June with National Aboriginal Day, through Saint-Jean-Baptiste Day (24 June) and Canadian Multiculturalism Day (27June), concluding on Canada Day (1 July).