"i drink, you drink, we all drink" 
 
This can be do in conjunction with anything, basically it 
is a rule for the night. 
 
Get your buddys together, and do whatever. but let it be 
known that at anytime during the night anyone can call 
out "I Drink" and every one has to drink right then 
(or order and down) and there is no time limit to calls, 
they can be back to back or some time apart. 
 
Also people not in you group can call "i drink" 
anytime someone outside your group says the word "drink" 
in a statement, question, whatever- then everyone drinks.