The whole video is great, but make sure you stick around for the two guys at the 1:15 mark - they're not falling for it.
You may have noticed that when someone near you yawns, it can be nearly impossible to prevent yourself from doing the same, whether or not you're tired. A 2010 study found that yawning might be a sign of empathy and a form of social bonding, according to Discovery. The study was carried out by Molly Helt, a graduate student in clinical psychology at the University of Connecticut, after she noticed that her autistic son didn't copy her yawns while they were sitting together on an airplane.

People aren't the only animals that yawn - in fact, all vertebrates, including snakes and lizards, do it.
But only people, chimpanzees, and possibly dogs (as demonstrated in the video) are prone to contagious yawning.
Robert Provine, a developmental neuroscientist at the University of Maryland, says human yawning starts early - fetuses begin to yawn as young as 11 weeks.
Babies may be yawners, but contagious yawning doesn't seem to kick in until a little later: Helt's study found that kids only start to "catch" yawns regularly at age 4.

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