A character who is blasted in the face by a strong current of air — whether because of wind resistance from moving at great velocity (i.e. dog sticking its head out a car window, or human strapped into a very fast rollercoaster), facing a powerful fan, or getting caught in a strong wind — gets their lips and cheeks stretched backwards and flapping in the air with a wet sound, with the gums grotesquely exposed and droplets of saliva sprinkling. This is almost always a source of slapstick comedy and it's to exaggerate in animation, in which case the cheeks can stretch like rubber to impossible proportions.
- Berserk: In the Birth Ceremony Chapter, when Isidro and Puck track Casca and Nina's whereabouts to the cave where the pagans have kidnapped them, Isidro tells Puck to fly with the news to Guts as fast as he can while Isidro himself stalls for time. Fully appreciating the urgency, Puck launches himself at such cartoonish speed that the air resistance causes his cheeks and even his eyelids to flap!
- Reebok's 2015 ads for Ventilator shoes depict people having their faces struck by an unseen wind from the shoes, with cartoonishly flopping cheeks.
- At the end of Toy Story, when Woody and Buzz Lightyear fly on a rocket to catch up to Andy's car, Woody's cheeks flap around from the wind in his face. Buzz isn't affected, because he's wearing a helmet.
- This happens to James Bond in Moonraker while he is in the Centrifugal Farce machine.
- Fat Man & Little Boy (1998). Robert Oppenheimer from the blastwave when he's watching the first successful test of a nuclear weapon.
- X-Men: Apocalypse. Seen when Quicksilver uses his super-speed to rescue everyone from the exploding Xavier mansion, especially when he grabs a bulldog and there's a close-up shot of him racing it down a hallway.
- When Top Gear tested out the Ariel Atom (which doesn't have a windshield), Jeremy tested out the acceleration and the headwind blew his cheeks outward. He would later claim that the car's acceleration can rearrange your face.
- Happens to the Doctor when leaving Earth by rocket in "The Ambassadors of Death". Jon Pertwee actually let himself be blasted in the face with air to do the shot.
- Also used in Battlestar Galactica for someone going in the opposite direction; from space down to a planet's surface. According to the episode commentary, the air-blowing method is dangerous due to the risk of creating an embolism.
- Blake's 7. Our heroes are trying to work out how to pilot the Liberator, an alien vessel of unknown technology, and ask What Does This Button Do? Cue them being hurled to the deck as the Liberator accelerates to Ludicrous Speed; shown by planets rushing past and closeups of our heroes with the G-force buffeting their faces.
- Happens to Johnny Bravo as he looks out the window of a hi-tech bullet train in the episode "Runaway Train".
- Phineas and Ferb
- In the episode "Out to Launch", it happens first to Phineas as he's training on a makeshift centrifuge (actually a merry-go-round), and later to Candace once she finds herself on board of a starting rocket (she complains that she can't hear anything because the flopping cheeks are covering her ears.)
- Taken Up to Eleven by Ferb when repairing & "tricking out" Meap's spaceship - not only do his cheeks flap, but his whole face comes off his skull, which he pulls back onto himself.
- Occurs sometimes in My Little Pony: Friendship Is Magic, e.g. to Rainbow Dash as she flies at supersonic speed in "Sonic Rainboom."
- The Simpsons: In "Deep Space Homer" both Homer's and Barney's cheeks flap when subjected to a centrifuge during astronaut training.
- In the My Little Pony: Equestria Girls movie, when Twilight introduces herself to the human Pinkie Pie, Pinkie, surprised that Twilight knows her name, lets go of the end of a balloon she was blowing up, which blasts the air into her face causing her cheeks and lips to be blown back.
- Exaggerated in the Roger Rabbit Short Roller Coaster Rabbit, with Roger's cheeks and eyelids flapping way behind his face.