Serious Mode

Serious Mode (for lack of an official name) occurs under certain conditions and removes minor jokes while it is in effect. It is entered automatically in certain circumstances.
== Serious Mode Occurrences ==
* When fighting a Boss Monster (Toriel, Asgore, or Asriel).
** With Asgore, the Serious Mode flag is not always cleared properly, and may persist if the protagonist dies or quits.
* During the Genocide Route–exclusive fights against Sans and Undyne the Undying.
== Effects of Serious Mode ==
* Items with comically shortened titles in encounters are abbreviated in a less humorous way.
Name 	Usually shortened to	Becomes
Spider Donut 	SpidrDont 	SpdrDonut
Spider Cider 	SpidrCidr 	SpdrCider
Butterscotch Pie 	ButtsPie 	Pie
Tough Glove 	TuffGlove 	Glove
Manly Bandanna 	Mandanna 	Bandanna
Unisicle 	Unisicle 	Popsicle (use text stays the same)
Cinnamon Bunny 	CinnaBun 	C.Bun
Abandoned Quiche 	Ab Quiche 	Quiche
Ballet Shoes 	BallShoes 	Shoes
Old Tutu 	Old Tutu 	Tutu
Annoying Dog 	Annoy Dog 	Dog
Dog Residue 	DogResidu 	D.Residue
Astronaut Food 	AstroFood 	Astr.Food
Instant Noodles 	InstaNood 	I.Noodles
Glamburger 	GlamBurg 	G.Burger
Legendary Hero 	Leg,Hero 	L.Hero
Torn Notebook 	TornNotbo 	Notebook
Cloudy Glasses 	ClodGlass 	Glasses
Stained Apron 	StainApro 	Apron
Worn Dagger 	WornDG 	W.Dagger
Heart Locket 	<--Locket 	H.Locket
Undyne's Letter 	UndynLetr 	Letter
Undyne's Letter EX 	UndynLtrX 	Letter
Popato Chisps 	PT Chisps 	Chips
Mystery Key 	MystryKey 	Key
Steak in the Shape of Mettaton's Face	FaceSteak (Fsteak) 	Steak
Hush Puppy 	HushPupe 	HushPuppy
Temmie Armor 	Temmie AR 	Tem.Armor
* Instant Noodles displays a short use text (being eaten dry) and recovers 90 HP instead of displaying pages of use text (being cooked for a long time) and recovering 4 HP.
* Spider Donut's "Don't worry, Spider didn't." alternate use text will not appear.
* The following items do not make sounds when eaten:
** Hot Dogs and Hot Cats
** Glamburger
** Legendary Hero
** Dog Salad
== Cut Items Affected by Serious Mode ==
Items cut from the game that had their normal abbreviations changed to something less humorous.
Name 	Usually shortened to	Becomes
Pumpkin Rings 	PunkRings 	PmknRings
Stoic Onion 	StocOnoin 	Onion
Ghost Fruit 	GhostFrut 	GhstFruit
Puppydough Icecream	PDIceCram 	Ice Cream (use text stays the same)
== Trivia ==
* Dog Residue is the only item that makes a sound when used in this mode.
de:Ernster Modus
fr:Mode Sérieux
ja:Serious Mode
pl:Tryb Poważny
pt-br:Modo Sério
ru:Серьёзный режим
zh:嚴肅模式