We’ve seen it time and time again: The TikTok algorithm can turn the most mundane moment into a viral trend. “Group 7” is the most recent instance of this, and I’m here to explain the origin of this exclusive club that everyone on the internet suddenly wants to join.

It all started when musician Sophia James decided to test the TikTok algorithm while promoting her new single, “So Unfair.” She posted seven videos in a row, each using the song, to test which one got the most reach. She then grouped viewers based on which video in the numbered batch appeared on their feeds.

“It always has been and always will be me vs. the algorithm, and today I’ve decided that I am winning,” James said in the second video, vaguely alluding to her internet experiment.

By the fourth video, she spelled out her intentions on the screen: “If you’re seeing this you are in group 4,” it reads. “I am posting a bunch of videos and seeing which ones reach the most viewers. This is the fourth post of the batch so you are group 4.”

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Videos number five and six followed a similar format.

But as fate would have it, it was the seventh video in the series that really took off.

“If you are watching this video, you are in group 7,” James said. “I have posted seven videos tonight and this is the seventh one — just this little science experiment to see what kind of video gets the most reach out of the seven.”

“i hearby declare group 7 is the most elite group,” one viral comment says.

“Group 7 is the hot girl group I don’t make the rules,” writes another.

Someone else said, “I have immediate beef with groups 1-6”

The trend’s origin story really is that simple and arbitrary, but the Group 7 lore has taken on a life of its own. Those who have claimed Group 7 status are flooding the comments of the previous six videos to declare their supremacy. Here’s a glimpse of video four’s comment section:

The TikTok accounts for many popular brands have gotten in on the joke:

Many public figures have, too. Outer Banks actress Madelyn Cline posted a TikTok, saying, “Good morning group 7 baddies how we doing.”

Even Shark Tank investor Barbara Corcoran and dancer Ezra Sosa from Dancing with the Stars posted their takes on the Group 7 trend.

“Sharks do you invest in music careers,” Sophia James commented on Corcoran’s post.

TikTok user Rebecca (@rebeccapousma) posted a viral video explaining the Group 7 lore: “Let me explain what it is, from a Group 7-er herself,” she begins. “Through the power of TikTok, Group 7 has become an inside joke with a bunch of strangers, and it’s incredible. I haven’t seen anything like this in a while.”

Rebecca explains, “This is Sophia James, she posted a TikTok and she says, ‘If you’re seeing this, you’re in Group 7.’ The comments are popping off. Everyone is just like, ‘Oh, group 7 is full of a bunch of baddies.'”

She then breaks down the marketing genius behind it all, explaining that the song is now going viral because it’s the audio for a series that doubles as both an algorithm experiment and an interactive trend. “It is the best marketing technique I have ever seen a musician do,” she says.

It’s clear from the comments that others are keeping the Group 7 banter alive, further fueling the “immaculate” marketing move:

So, what group are you in? And if you’re not really sure, this advice from Slim Jim could bring clarity: