One example of Nonverbal Behavior which is both interesting and joyful - is that the mere act of watching others laughing has a strong tendency to make us laugh as well. Thus laughing is one example of a "Behavioral Contagion" as well as type of "Mirroring". This phenomenon of "catching laughter" is true even if we don't find the subject about which they're laughing particularly funny, if we don't know what they are laughing about - or even if we don't speak their language.
It's not too surprising that laughter is more common with family and friends vs. acquaintances or those people whom we haven't met. Of course the vast majority of those watching this video don't know Hailee Steinfeld or Woody Harrelson - although we may some affinity for them through their acting (or Ms. Steinfeld via her music). If you have a particular foreknowledge or fondness for one or both of these actors - you'll most likely find it easier to laugh with them in the "blooper" section of the above video (1:19 - 1:49) from their recently released film, Edge of Seventeen.
It's also true that when we see another person suppressing laughter - it further "primes" our brain to mirror their behavior and engenders the odds of us crescendoing into a deep laughter. Although we laugh 30 times more frequently when we're in the presence of others, comedians often use this technique of maintaining an expression of a barely-contained laughter as a catalyst to make their audiences' belly-laugh more easily. You can even practice this on yourself as a spontaneous mood elevator or in the presence of others whenever your instinct tells you that laughter may act as a social lubricant (which is of course, very often).
Think of a particular comedian or funny film scene which has this effect on you. Watching the performance several times so that you can recall it easily will allow you to access the memory and re-create the scene (and thus also the true emotions) in your psyche. This is a variation on the Stanislavski method. Of course you probably can recall several movie scenes which has this enjoyable emotional trigger for you - and after watch Harrelson and Steinfeld you may now have another scene to add to your collection (especially since you now know some of the backstory).
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