In Portland, Oregon yesterday, a little bird landed on Bernie Sanders' stage and then, while Senator Sanders was talking about it, the bird flew up on his lectern. His supporters went wild and, along with the Democratic candidate, took it as a sign. The little aviator has been dubbed "Birdie Sanders".
This image was taken during 0:08 in the video above.
Note Senator Sanders' eyes. His eyelids are opened extremely. This lasted approximately 1.2 seconds.
This is eyelid configuration and its brevity are highly characteristic of sincere surprise.
When a smile is sincere (Duchenne Smile) the eyes are always partially closed. Here his eyelids are nearly completely closed.
Although it's difficult to visualize, the lower eyelids also have the additional feature of an evanescent, concave-up furrow. This is another requirement of a sincere smile. What are the other features of a true smile?
In just a few seconds we see two classic and sincere facial expressions - first surprise, and then joy-happiness. When surprise is sincere, it always is very brief (usually just a second or two) and it's always followed immediately by a second sincere emotion (joy-happiness as in this example, anger, fear, disgust, sadness, etc.).
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