Last night while announcing his upcoming retirement from "Late Show with David Letterman", the longtime comedian displayed a relatively uncommon (and even less appreciated) nonverbal signal.
During the 1:15 - 1:16 segment in the above video (and isolated in the images below), David Letterman curls his lower lip tightly inward over his bottom teeth while pulling up his upper lip. The lower lip is temporarily met with his tongue in a variation of a "Tongue-in-cheek" body language-facial expression. His upper lip's retraction exposes a greater amount of the teeth than is typical. This "Lower Inward Lip Roll with Upper Lip Retraction" is subconsciously initiated and performed as a mode of suppressing Mr. Letterman's laughing from further crescendo.
Thank you Dave for all the laughter.
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