A card game used to test the potency of your marijuana. The more difficult it seems, the stronger the weed.
Stoner1: "Stoner Concentration is played like regular Concentration, only the cards are dealt face up. You have to turn two cards over and find a match."
StraightPerson: "But that's crazy!!! You're only matching the backs, and all the backs are the sa...."
Stoner2: "Cool, man. Blaze one up and deal!!!"
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