Bartok

Get a standard pack of cards (remove jokers) and some rowdy friends, because here are the rules:

1. Choose a dealer. After each hand, the player on the dealer's left should become the new dealer. The deal is 7 cards each, with one card placed face up in the centre to start the discard pile, and the remainder face down as a draw pile.
2. If a player breaks any rule, either purposefully or accidentally, and the breach is noted by other players, that player must immediately draw a penalty card.
3. Players may not ask questions while the game is in progress.
4. Players may not address or refer to any other player by name while the game is in progress.
5. Players take turns in clockwise sequence. During a player's turn, they must either discard a card from their hand which matches the suit or number of the card on top of the discard pile, or if they cannot do so, draw a card.
6. Whenever the number of cards in a player's hand reaches one, they must say "Bartok".
7. The first player to rid their hand of cards wins the hand. The winner of the hand must invent one new rule before the start of the next hand.

Oh, what's that? "What sort of new rules can you invent?"

I'm glad you asked... Here are some samples:

• Whenever an ace is played, the person playing it may declare it to be any suit.
• When a 7 is played, the direction of play is reversed (clockwise becomes anticlockwise, and vice versa).
• Whenever the number of cards in a player's hand reaches two, they must say "Bartok minus one". Note that this includes when a player goes up to two cards because of a penalty card drawn for not saying "Bartok".
• When a 2 is played, the next player must forfeit their turn and draw two cards instead.
• When a black 6 is played, the player two positions to the right of the current player must miss their next turn.
• Red queens shall be considered 5s for all purposes, black 5s shall be considered queens for all purposes.
• Any player who plays a jack must immediately quote a line from a Monty Python sketch. Lines previously quoted in the same game do not count.
• When a red 9 is played, the person whose turn was two players before the current person's turn must moo loudly like a cow.
• When a card is played which causes the numerical value of the top two cards on the discard pile (counting jack=11, queen=12, king=13) to sum to 14, the player who played the second last discard gets an extra turn between the players who would otherwise have their turns next and next again.
• All clubs shall be considered as cards of their numerical value plus 5, modulo 13.
• When a black card of value 3 less than the previous discard is played, all cards which are currently clubs become diamonds, and vice versa.

Oh dear... Yahoo actually has a category for Bartok and similar games.