I was speaking to my mother-inlaw told me about an article she remembered. She is a massive Royal fan, she recalled "the young Royal couple throwing a rocket foam-thingey."
With that said, I set about looking into this, and found the very article :)
"Attending one of her final Royal Jubilee tour obligations with Prince William by her side Wednesday in Nottingham's Vernon Park, the 30-year-old Duchess (a field hockey champ during her high school days) threw a rocket-shaped foam javelin when visiting with local schoolchildren.
Credit: Phil Noble - WPA Pool/Getty
Credit: Phil Noble/AFP/Getty
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Whoever said the Royal British Family aren't able to have fun :)