The One with All the Poker - S1-E18
Question: After playing poker for the second time and winning over the girls, the guys say something like "Thanks for teaching us cross-eyed Mary." I assume it is a poker technique, however as a poker player, I've never heard about it. Is anyone familiar with it?
Answer: It is largely believed that a player's eyes can give away a good or bad hand and that good poker players need to have a "poker face" - not moving eyes or making facial gestures. If a poker player has cross-eyes, the implication is that other players will not be able to "read" that person's face or be able to discern if the player has a good hand or is bluffing.
Chosen answer: I've been unable to locate any information about an actual poker game or technique called "cross-eyed Mary." The only reference I can find to "Cross-Eyed Mary" is a track on the 1971 Jethro Tull album "Aqualung." It's unlikely Joey is referring to the song, so I am guessing it's just something the show creators made up, possibly implying that Monica's aunt taught them a new variation/technique/trick so they could win and they still ended up losing, teaching it to the guys in the process.
Michael Albert