Each player draws a card that he is not allowed to see. He holds the card to his forehead so that all other players can see the card (a cap is useful with this game). The player to the right of the dealer must now bet the number of units of liquor to think he has the highest card.
You can use up to half a liter of beer per shot glass. Now the other players have to bid until there are only two players left. The player with the highest card wins and does not have to drink anything. The loser must drink the number of units that have been deployed until then.