During deep, sincere laughter or in moments of a true smile associated with particularly pronounced levels of joy (not a slight smile), there is one nonverbal component which is rarely appreciated and almost never discussed - Jaw Retraction.
In the above Jimmy Kimmel Live video, Elizabeth Moss, the star of "The Handmaid's Tale", laughs deeply at multiple times. During 4:04 (image below), the actor can be seen laughing while she turns her head to her right - allowing us to see her head in profile. Note the degree to which her mandible (Jaw) pulls backward.
When you want to smile sincerely (or laugh deeply) - the best way to do so (even if you don't feel particularly happy) is to initially "smile with your eyes". This must include closing your eyelids partially - or almost fully. Next, without letting your "smiling eyes" relax, begin retracting your jaw. When these two crucial nonverbal components are performed in this specific order, you'll be very pleasantly surprised as to just how readily this will precipitate joy.
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