You take a pack of cards and make 3 circles with them (one small one surrounded by another larger one, surrounded by the third, largest circle).
You call out black or red and then pick a card from the outmost circle.
If you get the color right you get to hand out the number of drinks/shots that is written on the card.
If you get the color wrong you have to personally take that many. When giving out the drinks you don't have to give them all to one person.
If you get Jack it's waterfalls, Queen is Questions, King is categories, and Ace is rules.
You start on the outside circle. When it is finished, you go to the middle circle. Now the number of shots/drinks is twice the number on the card. After that circle you do the smallest circle and now the number is 3x what's on the card!!!!
My biggest problem after playing for a while is remembering that the cards only come in black and red.

Green seems like a really good idea a lot of the time.
My personal favorite rule is having to end every sentence you make with a noise or random word like "tuba".