LONDON - The Korea politics professor who became a viral sensation after his children interrupted a BBC interview says he has been pulled over by police for selfies and photographed buying milk in the year since the broadcast.

Robert Kelly of Pusan National University was commenting on the downfall of impeached president Park Geun-hye when his daughter Marion waltzed into his home office, followed by his toddler son James, who wheeled in on his baby walker.

Suddenly the implications of a parliamentary vote turned into what the BBC described as a “perfect piece of physical comedy”.

Kelly’s wife Kim Jung-A, who was watching on television from their living room, flew in seconds later, flinging her arms in a desperate attempt to retrieve the young intruders, before returning on all fours to reach out and close the door.

The clip spread like wildfire online and provoked widespread debate and commentary in media around the world.

It is the most-watched video ever on the BBC‘s YouTube page, with more than 27 million views - half as much again as the second-placed item, drone footage of the Nazi concentration camp at Auschwitz in Poland.

A year after the broadcast, Kelly wrote on the website of the Lowy Institute, an Australian think tank, that the subsequent 12 months had “mostly been fun, and sometimes weird”.

“I was photographed buying milk at Costco once, because apparently BBC Dad’s calcium consumption is a hot issue,” he said.

“A cop in South Korea once pulled me over to ask for a selfie.” - AFP