Ah, the close-up of a mouth appears on the screen. Potentially it can be a sign of mystery, used to hide the identity of the person speaking. Otherwise it can just be to emphasize the mouth.
This is a sister tropes of Eyedscreen
, which features a screen shot of a pair of eyes.
Needs More Examples
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- Diet Pepsi: This commercial from 1984 is an example: 
- Any commercial hawking teeth whitening or toothpaste is prone to this.
- This Coors Light commercial from 1997. 
- The numerous Pepsodent commercials such as this one: 
- The theatrical poster to Inside Deep Throat depicts a woman's mouth with the movie title in between the half-open lips.
- In the 1985 film, Weird Science, a scene in which Anthony Michael Hall and Ilan Mitchell-Smith are having a conversation in the shower stall during a party, we get shots of their mouths.
- A closeup of Patricia Quinn's mouth lip-syncing to "Science Fiction Double Feature" is used for the opening credits of The Rocky Horror Picture Show.
- Rick Springfield: "Bop 'Til You Drop"
- LL Cool J: "Going Back To Cali"
- and this parody from Colin Quinn: 
- Frank Zappa: "You Are What You Is" 
- One of the many, many shots in "Dare to Be Stupid" is "Weird Al" Yankovic's head, upside down and with googly-eyes stuck on his chin, with the camera pulled up close to the mouth.