The rules are simple. Somebody starts by picking a category and challenging someone to name something in that category. For instance, you might select actors in anchorman. Once a category is chosen, you have to challenge a friend who must then name something in that category. If they get it right, they point to another player who must also give an answer. This continues until somebody can’t name anything, or repeats an answer that has already been given. When this happens, that player must drink. Once the punishment has been served, this person becomes the caller and thinks of a new category.
Categories is best played quickly, so pausing too long will incur the penalty. The group can decide by general consensus how long is too long. Penalty drinks can also be handed out to those who choose a category that has already been chosen and to those who ‘pass-back’ to the player who just chose them.