Toward the end of the film Rounders, the main protagonist, Mike McDermott, decides to play his $20k bankroll against Teddy KGB in Texas Hold'Em, after the latter taunts him. After an indeterminate amount of time, KGB has apparently won a large part of it back, but then something happens.
At the flop, 3♦ 5♠ A♣, Mike, who, holding A♥ 5♦, has top two pair, gets ready to bet, but hesitates for a moment. Then Teddy grabs an Oreo from his rack and splits it open while holding it to his ear.
At this moment, Mike realises something. He decides to check instead, which prompts KGB to make a big bet. Mike then folds, turning over his hole cards, saying
I'm laying this down, Teddy. Top two pair. It's a monster hand, and I'm gonna lay that down 'cause you got two-four, and I'm not gonna draw against a made hand.
The two-four would give KGB a straight, of course. Then KGB gets upset that Mike didn't call, indicating that he indeed has a straight. Mike then narrates
The rule is this: you spot a man's tell, you don't say a fucking word. I finally spotted KGB's. And usually I would've let him go on chewing those Oreos till he was dead broke.
That KGB's tell is connected to his Oreos is pretty obvious. Is his tell simply that he eats an Oreo when he's got the upper hand, though? I find it hard to believe that such an obvious tell would go unnoticed for so long by a seasoned poker player like Mike. Or is KGB's tell more subtle than that?
I've noticed that, when KGB holds a strong hand, he splits an Oreo while holding it to his ear. This also happens at the beginning of the movie, in the hand that makes Mike go bust:
However, when Teddy is bluffing, trying to represent an Ace against Mike's pocket kings, he splits an Oreo while looking at it instead:
What is Teddy KGB's tell? Is it indeed that he listens to the sound of the Oreo splitting when he holds a strong hand?