The rules are Malfoid's and take four minutes: winner names a forfeit, loser pays it, nobody is allowed to be dignified about it.

MioneThat is not a rule, that is a threat with a deck of cards attached.

MalfoidIt is a very old family game. My father played it with the Wizengamot and everyone got on extremely well.

Nobody asks what the forfeits were. The first hand is dealt before anyone thinks better of it.