Quarters
The amount of players doesn't matter much.  All the players sit around or at a table.  Then you try to bounce quarters off the table and into the shot glass.  If they do, they can tell any other player to drink a shot and also recieves another turn.  If the person doesn't get it in the second time, the next person goes.  You can use anything in the shot glass, I use Sprite, because I can't get my hands on any tequila! Curse them. 
I Never
   Every person at a table has eight shot glasses.  You go around in a circle and say one thing you've never done.  If you've done  the thing that the person says, you do a shot, and the first one out of shots loses, or wins in my perspective. 

*A variation on the game is you saysomething you've have done while still saying "I never" before hand.

*Another variation is instead of the people who have done it drink, the people who ahven't drink.  I use this rule more often then not so I win.  He he.
The Book Cover's Drinking Game
They say you should never judge a book by its cover.  Well for this game, that's exactly what you should do.  You and a group of friends sit in a bar.  When a stranger enters the bar, each person bets on what he or she will order based on what they look like.  You need to sit close to the bar to make sure you hear what they order.  The person who's closest wins the money. 

*Example: If someone guesses "scotch" and the person orders scotch on the rocks, then they still win.