P.J. Ackerson reports an American version of Screw Your Neighbor for 3-26 players in which everyone starts with four lives, represented by four equal piles of money placed in front of them. The last person left in wins all the money. Some play that anyone who is dealt a king must flip it face-up immediately after the deal. Kings get flipped over when someone tries to trade with one and no further trading takes place on that deal. If you have a jack and someone tries to trade with you, you show them the jack and they are not allowed to trade.
Trading continues with the person whose turn comes next.
David Murphy reports another American variation in which if two or more players have the same ranking card at the end, they are safe from losing a life. If they end up lowest, the lowest unique rank loses. It is not quite clear what should happen in the rare case where no one has a unique rank - I suggest that it must be a draw, so that no one loses a life on that hand. There are further descriptions of Screw Your Neighbor on Peter Sarrett's site and the Drinking Games site .