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!

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