Brainstorming

As we're designing tabletop games in Game Design, I've been tasked with coming up with some brainstorming ideas for mechanics and other things.

The idea I've been toying with most is a humorous board/card game.  I wanted something that had the feel of games that I would play with my best friend, and irreverent things like that is right up our alley.  Some mechanics/themes I thought of were:

• A card game where players know each other's cards but not their own.
• A mechanic where one player is the cop and has to figure out identity of another player
• A dice mechanic where players roll to keep their cards from being repossessed 
• A board game where players are racing to accumulate enough cards to open a shop
• A mechanic where one card belonging to someone else is constantly in circulation and can  be bought/sold
• A mechanic where players pay fake money to buy cards
• Two people roll dice for possession of a single card
• Humorous theme about cats building armor for rat wars
• Fantasy theme about building armies
• Mechanic of buying more cards giving more reputation points
• One player is traitor and the other players have to figure out who
• Mechanic where cheating is okay but only if not caught
• victory condition of the most cards
• victory condition of the least cards
• Victory condition of last one standing with original amount of cards intact
• Losing all cards results in player elimination
• Dice rolling mechanic to see who starts with most cards
• Handicap mechanic--player with most cards has to wait a turn to start playing
• Humorous/horror theme of vampires collecting bottles of blood
• Humorous theme about black market organ trading.

Theme:

As far as the themes I brainstormed, the one I'm most interested in is the black market organ trading.  I think it has the most potential for off colour humour, which is something I enjoy in games, and the idea of keeping and trading organs provides an incentive for the player to do well (especially if they're hypothetically your organs).

Mechanics:

One mechanic I thought was interesting was the idea of handicaps, one player starting with more cards but having to wait a turn to start playing.  It fits the theme well--one player is a more accomplished trader, and the others are up-and-coming.  I haven't play-tested it, however, but I can imagine that it wouldn't go over well.  It would require a lot of balancing in order to be fair to all players.

Another mechanic I especially like is two players rolling dice for a card.  This could work two ways: one player draws a card, and another player rolls because he wants it as well, or one player attempts to steal a card from another by rolling higher than him.  There would have to be a limit on how many steal attempts can be made for drawn cards (maybe even only once).