Serious Mode

Serious Mode (for lack of a known official name) occurs under certain conditions and removes minor jokes while it is in effect.

Known Serious Mode Occurrences

 * While fighting Toriel on any route.
 * While fighting Asgore on the Neutral Route.
 * This flag is not always cleared properly and may persist if the protagonist dies or quits.
 * While fighting the final boss on the Pacifist Route.
 * During a Genocide Route playthrough.

Known Effects of Serious Mode

 * Items with comically shortened titles in encounters are abbreviated in a different, non-humorous way,
 * Spider Donut, normally shortened to SpidrDont, becomes SpdrDonut.
 * Spider Cider, normally shortened to SpidrCidr, becomes SpdrCider.
 * Butterscotch Pie, normally shortened to ButtsPie, becomes Pie.
 * Tough Glove, normally shortened to TuffGlove, becomes Glove.
 * Manly Bandanna, normally shortened to Mandanna, becomes Bandanna.
 * Unisicle becomes Popsicle. However, using it in battle still displays the message "You ate the Unisicle."
 * Cinnamon Bunny, normally shortened to CinnaBun, becomes C.Bun.
 * Abandoned Quiche, normally shortened to Ab Quiche, becomes Quiche.
 * Ballet Shoes, normally shortened to BallShoes, becomes Shoes.
 * Old Tutu, normally unshortened, becomes Tutu.
 * Annoying Dog, normally shortened to Annoy Dog, becomes Dog.
 * Dog Residue, normally shortened to DogResidu, becomes D.Residue.
 * Astronaut Food, normally shortened to AstroFood, becomes Astr.Food.
 * Instant Noodles, normally shortened to InstaNood, becomes I.Noodles.
 * Glamburger, normally shortened to GlamBurg, becomes G.Burger.
 * Legendary Hero, normally shortened to Leg.Hero, becomes L.Hero.
 * Torn Notebook, normally shortened to TornNotbo, becomes Notebook.
 * Cloudy Glasses, normally shortened to ClodGlass, becomes Glasses.
 * Stained Apron, normally shortened to Stain Apro, becomes Apron.
 * Worn Dagger, normally shortened to WornDG, becomes W.Dagger.
 * Heart Locket, normally shortened to <--Locket, becomes H.Locket.
 * Undyne's Letter, normally shortened to UndynLetr, becomes Letter.
 * Undyne's Letter EX, normally shortened to UndynLtrX, becomes Letter.
 * Popato Chisps, normally shortened to PT Chisps, becomes Chips.
 * Mystery Key, normally shortened to MystryKey, becomes Key.
 * Steak in the Shape of Mettaton's Face, normally shortened to FaceSteak (or Fsteak with certain player names), becomes Steak.
 * temy armor, normally shortened to Temmie AR, becomes Tem.Armor.
 * Instant Noodles are eaten dry, skipping the excessively long preparation time and recovering 90 HP instead of 4.
 * Following items don't make sounds when eaten:
 * Hot dogs and cats
 * Glamburger
 * Legendary Hero