Follow the Leader - Yawn, Cough, Smile, Laugh

Do you feel the urge to yawn when someone else does? It's very catching. Even when my dog, Rascal, yawns, I find myself yawning, and vice versa, so this phenomenum spreads to more than one species.

Riding on the Metra to work on Tuesday, someone coughed and for some reason I coughed right afterwards,though I hadn't felt the urge moments before.

What about smiling? When you take someone's picture and tell that person to smile, have you caught yourself smiling,as if you were the person getting a picture taken?

Laughing? Have you wanted to laugh at absolutely the wrong time, and made others want to as well?

Why does this happen? Is there a scientic explanation, or is it just follow the leader?

What about you? Do you exhibit such involuntary reactions? Or, have you reacted inappropriately at the worst possible time, and don't know why? Have you ever started a chain reaction of yawning or something else? Please share.

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