Former President Obama joined Prince Harry of Britain during a live interview filmed as part of a television series, according to the first clip issued on Sunday.
The radio interview, scheduled to be broadcast later this month at the BCC, was recorded at the September Invictus Games in Toronto.
"Do I need a British accent?" Obama joked during the brief advance, interrupting the prince's description of his editorial process.
"Not at all," Harry replied before blatantly reminding the former commander-in-chief that his habit of taking long pauses before answering questions would not be tolerated and could result in him getting "his face."
The prince imitated a frown, provoking Obama replied: "I do not want to see that face!"
The conversation will focus on the "shared interest of the duo in building platforms for the next generation," said Kensington Palace. It will air on December 27 on the "Today" show on BBC Radio 4 as part of a series featuring Prince Harry.