Tropes about something which one would expect to exist (as an inevitable part of Real Life, or a logical extrapolation from known aspects thereof) being conspicuous by its absence. In some cases these are Acceptable Breaks from Reality that facilitate Conservation of Detail, but they often inspire a degree of Fridge Logic.
- Convection Schmonvection
In fiction, heat can only be transferred by direct contact. For instance, people can get within inches of magma and be perfectly fine, but if they actually touch the lava, they'll be fried instantly. (Don't try that in real life.)
- Get Back in the Closet
Homosexual relationships never go farther than suspiciously-close friendship.
- Hide Your Children
In video games where the player is able to inflict gratuitous mayhem on anyone unfortunate enough to cross their path, children are either utterly invulnerable or do not exist.
- Hide Your Lesbians
Homosexuals do not exist.
- No Bikes in the Apocalypse
- No Biochemical Barriers
Anything can copulate and produce offspring with anything else, logic and compatibility be damned.
- No Bisexuals
Everyone is either straight or gay. There is no middle ground.
- No Conservation of Energy
Energy can freely appear out of nothing and/or vanish into oblivion.
- Nobody Poops
Distasteful bodily functions are never shown onscreen.
- No Hugging, No Kissing
Romantic interactions are never shown onscreen.
- No OSHA Compliance
In fiction, facilities that are ridiculously hazardous are somehow allowed to continue existing in their present form, no matter how many people get maimed or killed in them.
- No Ontological Inertia
Got a problem? Eliminate the source of the problem and it'll be solved instantly!
- No Product Safety Standards
Nobody has any qualms against selling stuff with a knack for killing its owner.
- No Such Thing as H.R.
- No Periods, Period
The tendency for non-pregnant, fertile women to leak blood out of their vagina every month is completely ignored.
- No Peripheral Vision
People can't see anything that's not directly in front of them.
- No Punctuation Period
- No Theme Tune
We don't need no stinkin' leitmotifs!
- No Transhumanism Allowed
- No Zombie Cannibals
Undead will only consume the living — they never turn on each other.
- School of No Studying
- Social Services Does Not Exist
- There Are No Adults
- There Are No Bedsheets
- There Are No Coincidences
- There Are No Global Consequences
- There Are No Good Executives
- There Are No Police
- There Are No Tents
- There Are No Therapists
- There Is No Higher Court
- World of No Grandparents
Wait... this is an index!