Dubai's ruler Sheikh Mohammed bin Rashid and his son Crown Prince Hamdan took a casual spin on the London Underground wearing plain clothes.
Prince Hamdan captured the moment with a #selfie, uploading the photo of him and his father to social media.
Conveying the appearance of ordinary residents or tourists, fellow passengers probably didn't even take notice of the oh-so casual royals.
Of course, social media users took the opportunity to point out just how down to earth the Dubai royals are.
While it may seem highly unusual for Londoners to imagine their own royal family taking a metro ride, this isn't anything unusual for Sheikh Mohammed.