The photo racked up dozens of comments and more than 2,400 likes in two days, as viewers shared their horror and glee at the dumbfounding “glitch in the Matrix”.
“What in the Black Mirror is happening?” one wrote.
“This should be on the 6 o’clock news,” said another.
In a lengthy update, shared via her Instagram stories, Tessa said she’d gone back to the bridal shop for answers, asking the shop assistant if she could shed any light on the illusion.
But, like her, the woman apparently “lost her mind” and had no way of explaining the terrifying triptych.
Meanwhile, Tessa’s “very rational” sister was also on the case, and took the photo to members of the tech department in her office.
“There's (sic) eight men looking at the photo, and they're all screaming,” she reported back, leaving Tessa feeling even “worse”.
Eventually, she made a pilgrimage to the Apple Store in Covent Garden where she demanded to see a genius.
“It takes three geniuses before we find somebody, and each genius is more scared than the last,” Tessa recounted.
However, finally, a man called Roger was summoned – who, according to Tessa is “obviously the grand high wizard” – and he told her: “OK, I've never seen it this bad or this scary," but at least he knew what had happened.
Tessa said an Apple Genius final solved the mystery (@wheatpraylove/Instagram)
Roger explained that phones are computers not cameras, and so even when an iPhone takes a standard photo, it takes a series of burst images very quickly from left to write.
So at the precise moment the camera was snapping Tessa’s back, she must have raised her hands, causing it to process a completely different set of images on the other side.
“It’s made like an AI decision and it stitched those two photos together,” Roger explained.
Tessa further noted that Google Pixel has brought out new technology “where you take multiple photos and it chooses the best photo for you”, and that Apple is Beta-testing this technology for its iPhones.
Still, she said Roger admitted that the chances of what had happened to her occurring were “a million to one,” but at least his explanation made her feel better and she was finally able to sleep.
Wrapping up her account, the comic podcaster said ominously: “Is Roger the man that the Matrix bring out when you get too close to the truth? Who's to say?
“Did it make me feel better? Yes. Do I hope it makes you feel better? Yes.”
She also pointed out that the incident took place two days after Halloween, saying: “Is that important? No.