Queen Elizabeth and Prince Philip are the first to laugh when something goes wrong.
The 85-year-old monarch and her 90-year-old husband share a similar sense of humour, according to their grandson Prince William, and he revealed occasional royal blunders make them laugh.
He said: ''My grandfather makes my grandmother laugh because some of the things he says and does and the way he looks at life is obviously slightly different than her so together they make a great couple.
''One of the things I know that over the years they've loved is when things go wrong - they absolutely adore it because obviously everything always has to be right but when things go wrong around them they're the first people to laugh.
''The queen has seen so many parades or performances when there's a small slip up it tickles their humour.''
William also revealed his grandmother has provided such a great example as monarch that he has no idea how he will eventually follow in her footsteps.
Speaking in ITV1 show 'Elizabeth: Queen, Wife, Mother', he said: ''There's not much wriggle room left for me to try and find my own path but I will do. It's just a matter of learning what's gone before me. She's an incredible role model. I would like to take all of her experiences, all of her knowledge and put it in a small box and to be able to constantly refer to it.''