Prince Philip's grandchildren reveal the hilarious prank he would pull at the dinner table

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The royal family has reminded us that they do normal things inside their household as well. Prince William recalled how his grandfather used to play a practical joke involving mustard.

"He used to take the lid off [a tube of mustard] and put it in your hands... and then he’d squish your hands together to fire the mustard onto the ceiling,” the Duke of Cambridge said.

“He used to get in a lot of trouble from my grandmother for covering most of the places we had lunch and things with mustard on the ceiling.

Prince Harry added that he remembers his grandfather’s facial expressions as he reacted to the “craziness that was happening around him”.

The royal family was speaking as part of a new documentary celebrating the life of Prince Philip. More than a dozen royals have taken part in the documentary, sharing memories and reflections about the life and legacy of Prince Philip as they remember him.