The World’s Most Contagious Prank [VIDEO]

I know that there are reasons why you yawn. I also know there are reasons why you yawn when you see someone else yawn (something to do with human nature and survival) but that doesn't mean I still don't understand it.

The creative minds at RomanAtwood decided to film how contagious a yawn really is. They filmed it all over the world and yup I yawned several times while watching the video.