The brothers also admitted to frequently grappling over the TV remote, even though they enjoy the same comedy shows for the most part.
"'Friends' is always a safe bet," Harry said.
The brothers were joined by their father, Prince Charles, a rare triple interview to promote the 30th anniversary of the Prince's Trust.
The Prince's Trust pop concert at the Tower of London was to be broadcast live by ITV Saturday, featuring Will Young, Ozzy Osbourne, McFly, Pink, Embrace, Annie Lennox, Lionel Richie, Sugababes and Ronan Keating.
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