An episode of Black Mirror is making people question their sanity. No, really.

For fans of the Netflix anthology, this is nothing new, but in the case of one episode in the new season, the show's creator, Charles Brooker, has straight-up tried to make people think they've lost the plot.

What has this madman done this time?

In the episode titled 'Bête Noire', there's one tiny detail in a scene that plays differently for different viewers.

The second instalment of season seven follows Maria, a chocolate company executive whose grip on reality begins to fade when her former schoolmate Verity joins her workplace.

Watch the trailer for season seven. Post continues after video.

The plot reveals that Verity has developed a 'quantum compiler': a device allowing her to manipulate reality according to her wishes.

And like the theme of the episode, viewers at home are experiencing their own reality distortions. Ugh, yep!

Fans have discovered that Netflix appears to be releasing different versions of the same episode, leading some to accuse the streaming service of 'gaslighting' its audience.

During a scene where Maria and Verity argue about a fried chicken shop's name, some viewers report seeing the establishment called 'Barnies' while others see 'Bernies'.

"Mine started as Barnie's and everything switched to Bernie's... Are yall seeing the opposite?" one confused viewer wrote on X.

Black Mirror viewers are baffled that they're seeing different versions of the same episode.

Seriously, what is going on??

WHAT IS THE TRUTH.

This subtle change has got people second guessing what they saw and arguing with their friends over what happened.

It's basically the white/gold and blue/black dress all over.

Of course, the detail is a stroke of genius because the episode is all about gaslighting: the act of making someone doubt their own sanity and question their perception of reality.

By choosing such a random detail, the episode has put the viewer in Maria's position, as they're left wondering if they saw what they thought they saw.

Well played, Black Mirror. Well played.

Feature image: Netflix.