The Rules

Generally:
The center of the game is the idea that you cannot touch an alcoholic beverage with your dominant (defined as "writing") hand. This includes opening, carrying, pouring, drinking, adjusting, or anything. Again, you may not touch an alcoholic beverage with your dominant hand. If you are touching your drink with your dominant hand and a fellow participant in the game says "Bull Moose" and points you out, you must immediately finish that drink.
If a fellow participant calls "Bull Moose" in error, that person must finish his drink immediately. If that person does not have a drink, he must get one and drink the whole thing immediately. There is no "retroactive Bull Moose" call. If the person breaks the rule and you do not point him out while he is breaking the rule, then it counts as an erroneous "Bull Moose" call.
In order to join the game, a participant must say, "I'm in." Once the participant is in, the game lasts until the last day of classes in the Spring 2009 semester. No one will be permitted to drop out. The rules are in effect whether you're at a bar, at school, at home, out of town, wherever. A related post will have a list of all of the participants who are "in" and their dexterity.

Exceptions:
The following exceptions do not constitute a "Bull Moose" violation and will not cause a participant to have to finish his drink.
1. "Double-Fisting": If you have a drink in both hands, it is not a "Bull Moose" violation. However, you must drink out of the drink you're holding in your non-dominant hand. Once you finish it, you must then put that empty container down and switch your full drink to your non-dominant hand.
2. "Handing Out": If you buy drinks for a group or are bringing drinks to a group, you are permitted to hold a beverage in your dominant hand. However, once you have your drink - and only your drink - the rules come back into play.
3. "Cleaning Up": You are permitted to hold drinks in your dominant hand if you are cleaning up. Once you stop cleaning up, the rules start again.
4. Shots: Shots somewhat disqualify themselves. If you're taking a shot and someone calls "Bull Moose" on you, you simply have to finish the shot, as you would have done anyway. As such, the "Bull Moose" rule will not be applicable on shots.