"Drawing Calvin is easy! You just make a big mouth and add some hair!"Mouths. Some can be big, some can be small. And then there are these. This trope is for when a character shouts so loud, their mouth takes up the entirety of their face, presumably to imitate the effect of a Skyward Scream. A variant exists in which the mouth is viewed from the side. This is usually used in print and animation. Sometimes, mouth size and volume are related (i.e. a character speaking softly is indicated by a small mouth). A character with No Indoor Voice often talks like this. Often coupled with Suddenly Shouting, Big "NO!", Big "YES!" or Say My Name. Compare Demon Head, in which the entire head expands.
— Hobbes, Calvin and Hobbes
- The Smurfs are sometimes drawn with these type of mouths.
- The prime example is Peanuts, which used it quite often (like here) and is probably the Trope Codifier.
- Calvin and Hobbes also has it sometimes.
- Eventually lampshaded by Hobbes providing the above quote.
- Garfield uses the side-view variant often.
- Loud Howard from Dilbert constantly does this.
- Heart of the City uses this visual as well, albeit more often with laughing than shouting.
- Frazz, in which the title character looks like - but isn't - an adult Calvin Spiff also uses it a lot.
- Shown by a guy on the playfield of Earthshaker!, as he's being sprayed by a fire hydrant.
- The Loopy Martians in Big Bang Bar are modeled like this, in order to hold locked pinballs in their mouths.
- Pokémon uses this with Zubat's and Golbat's sprites, to convey screeching.
- There's also Generation III's Loudred and Exploud.
- Rhythm Heaven: The choir boys from Glee Club.
- In the 2D Sonic the Hedgehog games, Sonic does this if one dies by drowning. The same sprite is used when you die from anything in Sonic Spinball.
- From Jet Set Radio, we give you Professor K◊.
- Baby Mario in Yoshi's Island, whenever he's stuck in the bubble and crying.
- Several GMod videos do this.
- In Rayman Origins, whenever the characters get injured, their mouths will be huge. This even happens in the intro, when Rayman realizes he is holding the old man skeleton's skull in his hand, and he (as well as everyone else) start screaming. "WAAAAAAAAAAAAAAAAAAAAAAAAAAAA!"
- Egoraptor is known for this.
- Strong Bad describes what he would look like as a Japanese cartoon character:
"Then there's my mouth. Real tiny when it's closed; ridiculously huge when it's open."
- Brawl in the Family: Adeleine does this at the end of "Doppelgangers".
- Zoophobia did this a few times, such as Cameron's scream.
- SCP-096's mouth is 4 times the size of a regular human's mouth... & looking at it will result in you getting killed by the creature that its attached to.
- A variation pops up periodically in My Little Pony: Friendship Is Magic, where the characters are shown with a Volumetric Mouth when loudly cheering or singing. Noticeable examples include the end of the duet between Rainbow Dash and Fluttershy in "May the Best Pet Win", the chorus of "Smile Smile Smile" from "A Friend In Deed", and Apple Bloom's belches from "Sisterhooves Social".
- A classic Tex Avery MGM short with Red and Wolfie couples this with Vocal Dissonance, Big "NO!" and Suddenly Shouting.
- Felix the Cat has Vavoom, which predates Peanuts by a few years.
- Loud Kiddington from Histeria! talks this way, like Howard.
- In the Family Guy episode "Ready, Willing and Disabled", this is done with Stewie as a parody of Peanuts.
- Expect to see this in Teen Titans whenever people are arguing.
- In the Adventures of Sonic the Hedgehog episode "Grounder the Genius", Robotnik's mouth briefly becomes as large as his body when Grounder hurts his foot.
- Happened at least once in The Powerpuff Girls. "I don't wanna sleep on a ro-o-o-ck!" *sobs*
- This is probably the most well-known example in Tom and Jerry.
- Some fishes have mouths that can open several times wider than their heads, thanks to jointed jawbones and expandable cheek- and throat-pouches. The gulper eel and sarcastic fringehead are extreme examples.