Diana and Charles visited the Alcoa Aluminium Smelter Project in Australia in October 1985, where the Princess could not hold back her laughter about the Prince’s hardhat. Charles sported a white helmet with “HRH Prince of Wales” written across the front, with Diana giggling over his appearance.
Charles caught onto Diana’s laughter while visiting the aluminium factory, and cracked a joke of his own.
He said to workers nearby: “Do your wives always laugh at you when you’ve got your hat on?”
But royal fans said the clip showed Charles was “insecure” over being mocked by Diana.
One said: “He was annoyed and embarrassed! He even mimicked her laugh! Such an insecure bloke.”
READ MORE: Princess Diana laughs and smiles with Prince Charles in sweet Australia throwback video
Friends of Diana also claimed Charles made her feel “inferior” and “insecure”.
Andrew Morton, author of Diana: Her True Story, explained the Princess felt “ignored everywhere she went”, and concerned her friends over her marriage to Charles.
He added, quoting a friend of Diana: “Diana would, for example, never contemplate making any input into any of his special interests such as architecture, the environment or agriculture.
“Painful experience tells her that any suggestions would be treated with ill-disguised contempt. He makes her feel intellectually insecure and inferior and constantly reinforces that message.”