Queen Elizabeth II had quipped about her own death during a conversation with Sir David Attenborough.
Her Majesty passed away peacefully on Thursday (September 8) surrounded by her family members at Balmoral Castle in Scotland.
While the late Queen had many acquaintances, the 96-year-old veteran broadcaster and environmentalist was one of her key admirers.
Speaking about how climate change will have an impact on the trees over the next 50 years on the ITV documentary, The Queen’s Green Planet, the longest-reigning British monarch, joked: "I won’t be here though."
Watch the precious moment below:Attenborough chuckled at the joke as the late Queen - who has planted over 1,500 trees all over the world - grinned in footage of the pair captured by the TV network.
The famous broadcaster - who was first knighted by the monarch in 1985 - also paid tribute to her royal highness in a statement, saying that she had "an extraordinary ability to put you at your ease".
"If there was a technical hitch, she wanted to know what it was, and if it had a funny side, she was quick to see the joke," he said to Press Association, according to the Independent.
"Yet not for one second could you forget that you were in the presence of someone who had willingly accepted enormous responsibility and dedicated her life to serving the nation - that you were, in short, in the presence of royalty. The whole nation is bereaved," he added.
Queen Elizabeth II launched the charity, The Queen’s Green Canopy, in honor of her Platinum Jubilee Year in June, with the initiative to motivate everyone to plant more trees.
According to the Express, Attenborough told the Radio Times at the time that he was nervous about the project, saying: "Yes, there was a certain amount of apprehension because all sorts of things could have gone wrong."
"There were problems in that where the palace is, geographically, there are always police sirens and ambulance sirens that make filming difficult," he said. "But she took it all in her stride."
"It was a privilege, of course, a very nice occasion - and she was very gracious," adding "She is very unsolemn, very good at putting people at their ease."
Following Queen Elizabeth's passing, her son, now known as King Charles III, immediately took his place as her successor.
The 73-year-old issued a statement regarding the loss of his mother, writing: "The death of my beloved Mother, Her Majesty The Queen, is a moment of the greatest sadness for me and all members of my family."
"We mourn profoundly the loss of a cherished sovereign and a much-loved Mother," he wrote. "During this period of mourning and change, my family and I will be comforted and sustained by our knowledge of the respect and deep affection in which The Queen was so widely held."
Countless other famous figures across TV, film, and music have also paid honored the late Queen, from Elton John to actors Helen Mirren and Daniel Craig.