![Proof That Laughter Is Contagious [VIDEO]](http://townsquare.media/site/396/files/2011/12/laughter.jpg?w=980&q=75)
Proof That Laughter Is Contagious [VIDEO]
Laugh and the world laughs with you.
A couple of people on a train start laughing, and before long, most of the rest of the riders join in. Turn up your speaker and laugh along!
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Laugh and the world laughs with you.
A couple of people on a train start laughing, and before long, most of the rest of the riders join in. Turn up your speaker and laugh along!