Whoever decides to play the game, rolls a pair of dice. He gets up to 3 turns to get a high score, where:
 2 + 1 (Mex) is the highest
 double 6 next highest
 then double 5, etc
 then 6 + 5, 6 + 4, and so on down to 3 + 2, which is the lowest
 3 + 1 is a compulsory drink for the person who throws it (normally half a standard vessel)
Normally if someone throws a Mex, they sit on that. If the first person in the round only uses 1 or 2 throws then that is the maximum for that round. The lowest scorer in the round is the loser, and must drink half a standard vessel. If there is 1 Mex, the penalty doubles to 1 full vessel. If 2 Mex's, then the penalty doubles again to 2 vessels, and so on.....a maximum should be set!!!
If there is a tie for low score, then there should be a tossoff, with each player in the tossoff allowed the full 3 turns if required. Mexs in this round still count toward the final penalty.
Variations:
The Holding Rule  on the first or second turn, you may hold either 1's or 2's, but not twice in a row. I.E.  if you throw a 4 and a 1, then you may hold the 1, and throw the other die once only. From there you must either take what you are given, or throw them both again.
5 Turns  if things are a bit sedate, try using 5 instead of 3 turns. You will get more Mex's this way. 
