TikToker Josh Mollison (@joshuamollison) had been out on a walk when his friend spotted a black cab in the distance, with DIY Fake Taxi branding on it.
He filmed a video of the unusual ride and posted it online, soon finding it racked up 2.3 million views.
After the clip went viral, the car's owner got in touch - perhaps unsurprisingly, it turned out it wasn't Big John, but a man called Dave.
Josh told LADbible: "Me and my mate were on a walk, and he spotted the 'Fake Taxi'. Then we literally just filmed it and whacked it on TikTok, and kept walking and thought nothing of it.
"After a couple of hours it started to go viral and I got a message from this woman saying that it was her partner's taxi. He'd just bought the taxi a few years ago - it wasn't the Fake Taxi, it was just a taxi that for some reason the geezer's bought with the branding on it.
"He bought it for like a laugh almost, I don't know why.
"And then obviously he's just parked it there. He's actually trying to sell it funnily enough, trying to get rid of it."
After the owner reached out through social media, they asked if Josh fancied coming to take a look at the fan-made taxi to film part two of the TikTok saga.
the fan-made taxi to film part two of the TikTok saga.
The original video actually got taken down, but after appealing its removal Josh managed to get the clip back online.
While the first clip was offline, some people only saw screengrabs from the video on the internet, unaware that it hadn't actually been the real Fake Taxi - with some even mistakenly thinking Josh had accidentally stumbled upon a porn shoot.
But in his second TikTok video, Josh explained how the car actually belonged to a man called Dave, giving followers a tour around the taxi.
Josh continued: "We met up yesterday and I put up a part two, and I basically squashed [the misbelief that it was the real Fake Taxi] saying it's not the Big John geezer it's just this guy called Dave who's bought the taxi.
"I showed people round the taxi. And that was it."