This reddit post explains an episode of Seinfeld:
When deciding who gets the new apartment, Jerry tells George he'll 'choose' him for it after a failed attempt at coin flip. Jerry takes odds and George takes evens. What the hell are they doing? I have never heard of this game.
The answers link to an urban dictionary entry:
Basically, you choose odds or evens and remark "Once, twice, three, SHOOT!" each player either holds out a closed fist, 1 finger, or 2 fingers, therefore the total can either add up to 0, 1, 2, 3, or 4. If it is 0, no player wins. If it is even (2,4) the evens player wins and if it's odd (1,3) the odds player wins.
Seinfeld: George and Jerry played the Choose game in 'The Robbery' Episode to decide who should get the apartment, Jerry ends up winning.
Is the "Choose Game" an actual game?