If you think you know your favourite films like the back of your hand, the Mandela Effect may prove you wrong.
The strange phenomenon, only identified in the late 2000s, describes when many people remember something in a particular way, but are wrong.
If you've been dead certain something happened, but then found out it didn't, you've been victim to the effect, which was explored in a recent episode of Black Mirror.
Reddit users speculate it occurs as a result of the 'entire universe glitching', accidentally changing little details from history.
In truth, there's no single reason why the Mandela Effect occurs, but some think it's getting more frequent thanks to the internet spreading misinformation.
And it seems to have a potent influence on our brains when we're recalling moments from the movies.
So have you fallen victim to it?
Here are 10 on-screen examples of the Mandela Effect, from Star Wars to James Bond and Reservoir Dogs.
In Star Wars, C-3PO's silver leg often reflects the surroundings to make it look more golden (such as the desert scenes on Tatooine)
1. Star Wars
In the original Star Wars films, loveable droids R2-D2 and C-3PO, voiced by Anthony Daniels, are responsible for injecting a bit of comic relief.
Fans of the multi-billion-dollar franchise will likely tell you that C-3PO is gold all over - but in fact he is multi-coloured.
Believe it or not, the droid's right leg is completely silver below the knee.
It's thought people largely make this mistake because most scenes in the original Star Wars trilogy show C-3PO from the waist-up.
In other scenes - such as the desert scenes on Tatooine - showing his whole body, the silver leg often reflects the surroundings to make it look more golden.
2. The Empire Strikes Back
In the second Star Wars film 'The Empire Strikes Back', Darth Vader reveals to Luke Skywalker that he is his father. But what is the exact line in the movie?
According to research from YouGov, most people think the line uttered by the masked villain is 'Luke, I am your father', but this is a misquote.
The actual line from Darth Vader is: 'No, I am your father.'
Subsequent parodies from the likes of Austin Powers and The Simpsons may be to blame for us misremembering the true quote.
Another reason is that the misquote makes more sense outside the context of the classic scene.
3. Risky Business
Surely one of the most parodied scenes of Tom Cruise's entire career is from the 1983 teen comedy Risky Business.
It features Cruise as high school student Joel Goodson dancing around in his underwear to the song 'Old Time Rock and Roll' by Bob Seger.
But what is the character wearing in the scene?
Coming-of-age comedy Risky Business stars Tom Cruise in one of his earlier film roles - but the classic dance scene is often misremembered
In Risky Business, Tom Cruise (pictured) plays Joel Goodsen, a teen who is left to his own devices while his parents are away. Enjoying his freedom, he dances around the house to Old Time Rock & Roll by Bob Seger
What is the Mandela Effect?
The Mandela Effect is the strange phenomenon in which many people remember something in a particular way, but are wrong.
The name was coined by paranormal enthusiast Fiona Broome, who was convinced she remembered Nelson Mandela dying in prison in the 1980s.
In fact, Mandela's death was not until 2013, despite Ms Broome and many others recalling seeing his funeral on TV in the 1980s.
You may remember Cruise wearing sunglasses as he dances - but this is evidence of the Mandela Effect in effect once again.
Cruise is not wearing glasses during the whole scene and has his face pretty much unobscured throughout.
The confusion may come from Cruise wearing sunglasses throughout much of the film and in the official poster as well.
4. The Shawshank Redemption
In a pivotal scene in this film, commonly described as one of the greatest of all time, Andy Dufresne (Tim Robbins) escapes from his prison cell in the dead of night.
The next morning, the prison warden searches the cell and notices the giant poster of Andy's favourite pin-up, which he calls 'that cupcake on the wall'.
But which famous Hollywood actress is he referring to?
Many people are sure the poster is of Marilyn Monroe, known for her roles in Some Like it Hot and The Seven Year Itch.
But in actual fact it's fellow sex symbol Raquel Welch, as she appeared in the 1966 film One Million Years B.C.
The confusion may be due to the fact that Monroe appears on a poster earlier in the film, as does Rita Hayworth.
5. Casino Royale
Bond fans may recall 007 drinking a vodka martini in Casino Royale, the film starring Daniel Craig based on the very first James Bond novel.
But it’s a different concoction entirely that he’s made up on the spot - something he calls a ‘Vesper’ named after his love interest in the film.
Unlike the legendary vodka martini, the Vesper lacks vermouth and contains Kina Lillet, a liqueur made with white wine.
6. Moonraker
In one of the silliest moments in the 007 films, metal-toothed baddie Jaws (Richard Kiel) meets the woman of his dreams, Dolly (Blanche Ravalec), in 1970s caper Moonraker.
The gag that many people remember is that Jaws falls in love at first sight because she has enormous goofy braces to go with her girly pigtails and glasses.
But Dolly is actually braceless, featuring a beaming set of pearly whites.
On Reddit, people registered their disbelief that Dolly never had braces, with one saying: 'I swore she did and that was the joke. I've rewatched these movies in adulthood and still saw it.'
Another said: 'No, this is wrong. She had braces. What are you doing, trying to unmake the fabric of the universe or something?'
7. Pride and Prejudice
Admittedly, this 1995 adaptation of Jane Austen’s novel is a BBC TV series, but it contains one of the most famous on-screen examples of the Mandela Effect.
Colin Firth as Mr Darcy sent hearts racing during a scene where he climbed out of a lake wet-shirted - instantly turning him into a British sex symbol.
The thing is, this was never actually part of the episode.
In fact, he strips off, enters the lake, and in his next scene is shown walking back towards Lyme Park house before encountering Elizabeth Bennet (Jennifer Ehle).
According to recent research from YouGov, 49 per cent of Brits said Firth is seen emerging from the lake, while just four per cent correctly said he is not.
8. The Silence of the Lambs
In psychological horror The Silence of the Lambs, Clarice Starling (Jodie Foster) is sent to interview cannibalistic serial killer Hannibal Lecter in prison.
But what are the first words he uses to address the young FBI trainee from his prison cell?
'Hello Clarice' is the quote that people remember from this classic moment - but it's nowhere near his actual opening line.
Lecter simply says 'Good morning' - and incredibly he actually never says 'Hello, Clarice' in the whole film.
Jim Carey utters the misquote five years later in the film The Cable Guy, which may be playing with people's minds.
But curiously some movie fans distinctly remember it being said by Lecter.