Princess Diana was a very loving mother and wanted her sons to be as prepared as possible to cope with life as boys and later as men as well as members of the royal family.

On Prince William's first day of school at Wetherby, London, it was clearly not a normal child's first day of school: it was something the Princess wanted her oldest son to be prepared for.

"Princess Diana told him in the car, 'When you get to school, there will be a lot of media and photographers, so behave,'" Ken Whorf, William and Harry's former bodyguard, revealed to Yahoo's Royal Box (via.Mirror).

"You're going to be in this for the rest of your life," she warned.

But 5-year-old Prince William was not about to take the news lying down: getting out of the car with his mother, he told the photographer.

But in the end, he "behaved" and waved to the camera and smiled kindly.

Being followed by photographers has long been a major point of contention for the royal family, even more so than Princess Diana, who died in a car accident while driving to escape the paparazzi.

The current Duke of Cambridge himself once told his mother that she should leave England to escape the cameras that constantly followed her. In the end, however, it was his youngest son, Prince Harry, and his wife, Meghan Markle, who moved from royal life to sunny California to protect their privacy.