Prince William and Kate Middleton surprised commuters on the Tube. Here are 13 other times royals proved they're just like us on public transportation.

William and Kate took the London Underground's Elizabeth Line to the Dog and Duck pub in Soho to speak to workers about how the business was preparing for King Charles' coronation.

William, Kate, and Harry attended the Charities Forum event to join children from the charities they support onboard the Belmond British Pullman train at Paddington Station in 2017.

He even got to test drive it, as well as meet the manufacturers.

Prince Harry and Prime Minister David Cameron arrive by New London Bus for a UK business campaign event in New York City in 2013. 

Kate rode with actress Barbara Windsor on a 1960s Routemaster bus as they met staff and volunteers from The Royal British Legion London Poppy Day Appeal.

Charles also met employees working on London Underground trains.

Camilla and Charles traveled on a Metropolitan underground train from Farringdon to King's Cross as to mark 150 years of the London Underground in 2013.

Charles and Camilla visited the family-owned Wrightbus company in Ballymena, Northern Ireland, in 2013. 

Queen Elizabeth traveled on a Cambridgeshire Guided Bus to visit the Medical Research Council Laboratory of Molecular Biology in Cambridge in 2013.

Queen Elizabeth and Prince Philip took a train to Sandringham from Kings Lynn train station to begin their Christmas holiday.

Queen Elizabeth boarded a train at King's Cross Station in London in 2009.

Queen Elizabeth took the train at Waterloo International Station.

Queen Elizabeth made an official visit to Baker Street Underground Station to mark the 150th anniversary of the London Underground in 2013.

Queen Elizabeth passed though the Tube's gates at Heathrow Central in London.