Prince Charles Pranked Princess Anne In Unexpected Way [WATCH]

Prince Charles and Princess Anne behaved like any other pair of siblings back when they were children and played pranks on each other.

In BBC's new documentary, the Prince of Wales was caught on camera sneaking up on his younger sister, Princess Anne. Prince Charles tapped her back and surprised her. As a result, Princess Anne turned around and looked at her older brother while laughing.

Fans were happy to see a glimpse into the future king and the princess royal's relationship. One Twitter user found the sight "heartwarming."

"It is heartwarming to see their playfulness," Jerri wrote.

"Love it. I hope their relationship is still as warm and playful as all the childhood videos of them we’ve seen," Heidi Holyrood commented.

"Oh my, the Queen looks so tiny here. Love them all, looks like such a normal, fun family," Bepa wrote.

"Very cute their like kids again, wonderful to see them happy," another user wrote.

Meanwhile, others were wondering what Princess Anne told Prince Charles after the incident. According to Town & Country, Princess Anne "isn't famous for her tolerance of things she finds distasteful." She is very open about why she doesn't shake hands and how she hates photo-taking during walkabouts.

"We never shook hands. The theory was that you couldn’t shake hands with everybody, so don't start," Princess Anne said in the documentary titled "Queen of the World."

"So I kind of stick with that, but I noticed others don't. It's not for me to say that it's wrong, but I think the initial concept was that it was patently absurd to start shaking hands. And it seems to me that it's become a shaking hands exercise rather than a walkabout if you see what I mean, so that it has changed," she added.

Prince Charles and Princess Anne reportedly have the same opinion when it comes to Sarah Ferguson and Prince Andrew. They apparently don't like the Duchess of York's romance with their brother.

Princess Anne reportedly called Ferguson an "outsider" during a family lunch which infuriated the Duke of York. The latter apparently then demanded that she apologize to his wife. After the incident, there was a "very, very frosty relationship between Fergie and Anne."

Royal commentator Katie Nicholl also said that the Duke of Cornwall is annoyed with Ferguson and Prince Andrew's relationship. "[Andrew] has been a liability to the Royal Family," Nicholl said on Netflix's documentary "The Royal House of Windsor." "His relationship with [Sarah Ferguson] is one of the things, I’m told, that really riles Charles. It all contributes together into something that is just not very palatable."