There's a long-standing theory that everyone has a look-alike.
A recent experience on a Ryanair flight certainly supports that idea. A man sat next to a complete stranger – and discovered it was his doppelgänger.
The parallel pair snapped a selfie (a twinnie?) captured in the above tweet.
It's quickly become an Internet favorite, ushering in more than 2,000 retweets in six hours. As the Independent reports, another bearded brother from another mother came forward, presenting his own selfie as evidence.
Others have since joined the fun:
Want more doppelgängers? Check out CBS News' report on Francois Brunelle, a photographer dedicated to photographing look-alikes from around the world.