30/05/2013 07:01 BST | Updated 30/05/2013 07:02 BST

Yawning: The World's Most Contagious Prank (VIDEO)

Getting other people to yawn by yawning yourself - it's a prank that works across generations and across continents.

As this video from Roman Atwood proves.

He went around the world, casually yawning near strangers (as you do) - check out what happened above.

We defy you to watch it... and not yawn yourself!