Ever notice that most of the time when you yawn, another person around you will yawn as well? A guy decided to take that fact to a different level by seeing just how many people would yawn after he did. The results are hilarious and proves that this could the most contagious prank ever.

YouTube user RomanAtwood posted this video of him walking around random people and simply yawning. At one point, a couple of dudes even ask him why he's walking around yawning, and they tell him that he could spread germs. Others just yawn like most people do.

You're yawning now, aren't you?

Watch this hilarious video, and see if you can make it through the whole thing without yawning.

World's Most Contagious Prank