Eagle-eyed viewers of Netflix's runaway success series Squid Game have spotted something in the tug-of-war game that they think is particularly significant to the ending. You can see what they think they've discovered in the video below:
Oh, and it goes without saying that there are ABSOLUTELY LOADS OF SERIOUS SPOILERS from here on out, so only read on if you're up-to-date with the show, or just don't care about finding out some key things about it.
Right, now that everyone who doesn't want to know has gone - last chance, by the way - let's get onto it.
As we all know, the smash hit South Korean show sees cash-strapped people pitted against one another in various seemingly-harmless games, except - of course - they aren't.
In fact, they're exactly the opposite of that, and loads of people die in some pretty horrible ways.
Well, in episode four, one of those games is the classic tug of war.
The players must form teams of 10 people over the course of 10 minutes, before squaring off against one another.
On one team, there's a dude who is identified as Player 001. He's an old guy, and - well - it turns out at the end of the show that this isn't the first time he's seen this game played before.
Before the show, he claims that he played the game a lot as a child, and used a particular strategy to make sure that he never lost.
As the game prepares to start, everyone is padlocked to the rope, securing them to their death should they lose.
Well, everybody but one person, that is.
Player 001 is the only one without a padlock on his cuffs, meaning that he could have escaped should his team not have prevailed.
In the final episode, we learn that he is a billionaire and the creator of the game, which is foreshadowed throughout the show, but particularly in this part.
He's Player 001, for starters.
Oh Il-Nam, as he's actually called, has a brain tumour and just wants to play the game instead of waiting around to die.
People are just starting to clock onto this as the details are being shared online, and it's seriously got under some people's skin.
One said: "Me who wasted tears for that old man."
Another said: "Old man is behind everything."
Well, now you know. Never trust an old man who seems to be getting some sort of nostalgic joy out of playing a game where loads of people are getting brutally killed.