Hylaria

Like the name suggest, Hylaria is a game that invites you and a group of friends (or strangers) to have a wonderfully idiotic time. Set in a world that makes little sense, teams of players try to telegraph the content of their cards to their mates, without their opponents finding out what they mean.

Taught in under a minute, but endlessly replayable because the game taps into the creative nature of human beings.