Like many children, Prince Harry was very a very mischievous little boys and loved playing pranks on his family.
According to royal insiders, the Duke of Sussex would play tricks on the Queen, his grandmother, and was the "only one" who could fool her.
Harry and big brother Prince William would join their nan for tea on Sunday afternoons at her Windsor Castle home during their time studying at Eton College, which was just around the corner.
And while William would be happy to just make conversation with his grandmother, Harry had more mischievous ideas up his sleeve.
Former royal butler Paul Burrell said that he'd seen Harry tricking the Queen with fake flies.
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Speaking to OK! magazine, Paul said: "I know the Queen very well and I know she’s very fond of Harry.
"As William would sit and have tea with her after school, Harry would come and put plastic flies in the sugar bowl!
"It was hilarious. Harry was the only one who could trick his granny."
And it seems Harry got his mischievous charisma from his mum Diana, who was known for her sense of humour.
Not only did Diana approve of her son's cheeky side, she actively encouraged his funny pranks.
She loved Christmas and would put a lot of effort into finding her kids the perfect gifts, always hoping to make them laugh.
One year, Paul recalled Diana gifting Harry a piece of fake dog poo.
Speaking to the Mirror, he said: "She'd spend hours looking for jokey things for their stockings. One year, Harry got fake dog poo."
Harry thought it was hilarious and had a very cheeky plan for it - he was planning to hide it somewhere for his nan to find.
The Queen wasn't Harry's only victim though, as he's been known to wreak havoc at the Althorp estate.
"When Prince Charles and Diana brought William and Harry to Althorp, Harry was a little mischief," recalled the estate chef.
"He was stuffing slippers down the loo!" he said.
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