what's the scientific basis behind the screamy guy face?

https://puu.sh/Bfkyl/e18b82a19f.png https://puu.sh/BfkGc/c29f3f9c70.png
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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