Prince William knows what its like to live on a prayer.

The Duke of Cambridge recently relived a cringeworthy moment that occurred a few years ago, when Jon Bon Jovi and Taylor Swift got the royal a bit out of his comfort zone during a fundraising event at Kensington Palace in 2013.

William revealed the anecdote for an episode of Apple Fitness+ series Time to Walk, which was released on Monday. Apple is donating to three mental health charities the U.S.-based Crisis Text Line , Shout 85258 in the U.K., and Lifeline in Australia on behalf of the duke.

During the walk, he told a story that he couldnt believe he was retelling, as the story leaves him cringing.

The royal said that during events like the one at the palace back in 2013, he tries to be charming and interactive with guests. But normally, he can relax a little bit when the handshaking is over and the performing begins, as he switches to off-duty. Though on this particular night, the royal was sitting next to Swift, while the group watched Bon Jovi perform.