You can make a scary face by grabbing your bottom lip with your top teeth. When you do this, your mandible moves in an anterior direction. This is an example of

Retraction.

Explanation:

When someone suffers from lower eyelid retraction, it means that their lower eyelid has actually been pulled downward which is an example of a scary face.

Another example is by grabbing your bottom lip with your top teeth. When you do this, your mandible moves in an anterior direction.

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explanation: