Prince William Shares Princess Charlotte's 'Favorite Joke' at the Moment, and It's a Total Classic!

"That’s the one I hear a lot at home at the moment," the Prince of Wales said of the knock-knock joke

Prince William just gave a glimmer into Princess Charlotte's sense of humor.

The Prince of Wales, 41, made the revelation during a visit to St. Michael’s Church of England High School in Sandwell on April 25 to hear about their mental health initiatives. During a small group session to record for the school radio show, Prince William was asked to share a "dad joke," but he opted to quote a classic that is a current hit with his 8-year-old daughter, Princess Charlotte.

"I am here with the gang here talking about male mental health, and I've been asked to produce a dad joke. I was trying to channel Jack Whitehall because most of his jokes are pretty dad-like," the royal began referring to the British actor and comedian, as seen in a video shared to X by Rebecca English of the Daily Mail.

"I think what I'll do is say a joke that is Charlotte's favorite joke at the moment, that she keeps telling me," he told the pupils, adding that they’d have to interact for it to work.

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"Knock knock," Prince William began. "Who’s there?" the students replied in unison.

"Interrupting cow," Prince William continued.

As the kids started to reply, "Interrupting cow who?" Prince William interjected with "Moo!" prompting giggles from the group.

"That’s the one I hear a lot of at home at the moment," said the royal dad, who shares Prince George, 10, Princess Charlotte and Prince Louis, 6, with his wife, Kate Middleton.

"That’s the greatest one I can think of that's clean and broadcastable," he added with a laugh before receiving a compliment from one special student.

"It's good, it's good!" said 12-year-old Freddie Hadley, who sat next to the Prince of Wales.

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St. Michael’s Church of England High School came on the royal's radar after Freddie wrote a letter to Prince William and Princess Kate, 42. Freddie invited the royal couple to the school's celebrations for World Mental Health Day in October 2023.

King Charles' elder son replied with a personal message on X: "Good afternoon Freddie, I’m so sorry Catherine and I can’t be with you and the rest of the students at St Michael’s today. Tackling mental health challenges and stigmas head on is so important, please keep up this important work."

Prince William signed the message "W," indicating that the note came directly from him.

On April 25, the pair finally got to meet when the royal visited the school, where Prince William told Freddie, "Your letter worked."

Prince William got to see firsthand the work of the Matrix Project, which Freddie highlighted in his letter for bringing boys aged 11 to 14 together to develop ideas and projects to tackle mental health challenges. He joined a session with some of the boys and was told how they launched the #AmIManlyEnough campaign to encourage men to communicate their feelings and tackle taboos surrounding mental health.

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Freddie tells PEOPLE that it was a "massive shock" to see Prince William arrive at his school.

"He is a very nice guy," the student says. "When I sat down with him about what we do in school with our Matrix Project, I got more comfortable and I felt like I got into his way of thinking about it. He asked us about why we do our stuff and why he is an advocate for male mental health."

Freddie adds that William "said from working with charities for mental health he realizes — as he’s a male himself — he’s gone through those things before. He realizes it is such a massive thing in today’s society, and he wanted to step up and get these issues sorted out."

Prince William also met representatives of Student Voice to hear about their projects set up at St. Michael's to promote positive mental health and joined a workshop with students discussing issues related to well-being, including designing calm kits and their dream well-being hub.

"What a beautiful opportunity for our youngsters to shine a spotlight on everything we do in school," headteacher Christina Handy-Rivett tells PEOPLE. "And to have His Royal Highness, who pioneers and supports mental health, it was such a special moment.”

Prince William's day is set to continue with visits to two organizations dedicated to providing support for those who are homeless and fighting addiction.

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