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Famous Effects

Can you name these famous "effects" in a variety of different fields?
Quiz by
Xabi
Featured Quiz
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Last updated: January 5, 2026
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First submittedNovember 23, 2025
Times taken12,302
Average score33.3%
Rating4.62
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Description
Effect
Tiny changes in initial conditions can lead to large and unpredictable differences later
Butterfly
When a dummy medical treatment causes improvements due to patient belief
Placebo
Gases in a planet's atmosphere trap heat on the surface
Greenhouse
Waves appear to have higher frequency when the source is moving towards the observer
Doppler
An individual person is less likely to take action during an emergency when among a group
Bystander
When one event sets off a chain reaction
Domino
When a large number of people share a particular false memory
Mandela
When an attempt to censor or hide information backfires and makes it more widely known
Streisand
The path of objects and fluids is curved by the Earth's rotation
(in opposite directions on opposite sides of the Equator)
Coriolis
People overvalue things they partially build themselves
IKEA
Jurors expect unrealistic forensic evidence because of crime TV shows
CSI
Light striking a surface causes the emission of electrons
Photoelectric
Shortly after noticing something for the first time, you see it everywhere
Baader-Meinhof
People believe that others notice them more than they actually do
Spotlight
A group of connected users has exponentially more value as the number of users increases
Network
Individuals look more attractive when viewed in a group
Cheerleader
Beginners tend to overestimate their ability
Dunning-Kruger
Measured IQ scores tend to increase over time
Flynn
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33 Comments
Quizmaster
+6
Level ∞
Nov 24, 2025
Great quiz. I got 16/20 by some miracle.
Xabi
+4
Level 54
Nov 26, 2025
Thank you!
HyalineSkies
+2
Level 48
Feb 5, 2026
QM singlehandedly carrying the average on this quiz
XYU
+6
Level 62
Dec 2, 2025
5/20 for me. Very interesting; will have to go and look some of these up.
Quizmaster
+11
Level ∞
Jan 5, 2026
Note: A large percent, probably most, of results in psychology fail to replicate.

Even when the effect is real, it is often misreported by journalists who lack the scientific understanding to communicate it accurately.

Take any "effect" you hear about in psychology with a giant grain of salt.

Islandcarver
+2
Level 83
Feb 4, 2026
I can't resist the temptation to mansplain on a topic I know well. A psychology result is often hard to replicate because the context in the field where it is observed or the context artificially created in a lab cannot be replicated. This is more likely because psychologists fail to adequately explain said context in the interest of making the result appear universal (i.e., scientific) when instead it is contingent on the context. Let's not blame the journalists.
interopia
+2
Level 90
Jan 5, 2026
Nice! Also try Famous Effects in Science and Psychology!
overtired
+5
Level 88
Jan 5, 2026
Dang, I thought the answers were going to be Chorus, Distortion, Flanger...
interopia
+2
Level 90
Jan 5, 2026
Nice! Also try Types of Guitar Pedals and Effects!
LeoTheNerd1121
+2
Level 46
Feb 5, 2026
Fellow musician?
Neodymium
+3
Level 63
Jan 5, 2026
Mpemba effect was robbed!
Neodymium
+4
Level 63
Jan 5, 2026
the Mpemba effect was discovered after, while making icecream, Erasto Mpemba, short for time, put his mixture in the fridge without leaving time for it to cool. However, his hotter ice cream mixture ended up freezing before his classmates (who had cooled theirs down before freezing them).

ie. hot water, under certain conditions, freezes faster than cold water

loganite
+4
Level 93
Jan 5, 2026
Ripple effect for the first one?
FreeStater
+4
Level 81
Jan 5, 2026
I was thinking Snowball.
FreeStater
+1
Level 81
Jan 5, 2026
No Ken Burns effect? That's a pretty well-known one.
CarlosNZ
+2
Level 69
Jan 5, 2026
Cool idea for a quiz. You might want to be a bit more tolerant of spelling -- I think it should accept "Bahder" for "Baader", for example.
toowise
+2
Level 81
Jan 6, 2026
Although it does accept Bader !
leontodon
+4
Level 75
Jan 23, 2026
Perhaps it should accept "Worse"
Qikiq
+2
Level 89
Jan 6, 2026
Well, I should have taken this before today's daily quiz and I'd have gotten a 10/10.
FrozenSahara
+3
Level 68
Jan 6, 2026
Could've added the Cobra Effect on the list as well
cpec
+1
Level 75
Jan 6, 2026
Is the IKEA effect a more descriptive version of the endowment effect? If so, should both work there?
FrankiiLynx
+2
Level 89
Jan 7, 2026
This was hard! Only got 10/18, which is somehow still enough for 4 points haha. Cannot believe I missed Domino Effect though, I think my brain was frazzled by the others XD
buck1017
+3
Level 78
Jan 7, 2026
For attractive groups, i tried "Boy Band Effect" and "Spice Girls Effect" to no avail.
Algernon
+2
Level 74
Jan 7, 2026
Bleep me that is one tough quiz. I got six and could have got two more a different day, the others flew right over my head.
QuizApe
+1
Level 72
Feb 4, 2026
I wish the Mandela effect got a name change. A supposed collective false memory of Nelson Mandela dying in prison is one of the dumbest examples of this phenomenon.
Ampersandwich
+1
Level 61
Feb 4, 2026
Why? That's a reason it SHOULD be named as such
EverettHater
+1
Level 48
Feb 4, 2026
I guess I’m weirdly knowledgeable on types of effects.
Bill1066
+2
Level 73
Feb 4, 2026
Surprised the Tetris effect wasn't on here.
SantiHM23
+2
Level 63
Feb 4, 2026
Got cheerleader effect thanks to How I Met Your Mother, didnt think it was a thing outside of the sitcom
Fredorferb
+1
Level 72
Feb 5, 2026
I got cheerleader effect thanks to Gumball 😀
potatopierogi
+2
Level 71
Feb 4, 2026
Fun how Baader-Meinhof is in this quiz and it's featured the same day as "double a answers"
InterAlia
+1
Level 83
Feb 4, 2026
Maybe accept photovoltaic for photoelectric.
Deuteronomius
+1
Level 69
Feb 5, 2026
Tried Baader just for fun cause to duo are well known German terrorist, was very surprised the effect is actually named after them :D
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