There are well-known drawbacks to working from home: the isolation, the need for self-discipline.

But here is a new one: the invasion of the toddlers.

Robert E. Kelly, a political-science professor at Pusan National University in South Korea, learned this the hard way on Friday when he appeared as an expert on the BBC via Skype to discuss the South Korea impeachment scandal.

He appeared to be in a home office, with a door closed behind him. Shortly before the interview, he innocently let his Twitter followers know he would be on TV.