Boom Drinking Games

						Boom!

All you need is a bunch of people, small glass
and a bottle of anything alcoholic.
It is about numbers. You can play this game on 
any prime number. For example, on 7. The one who 
starts says 1, the person beside him says 2, and 
so onin a circular way. When someone has to say 
number 7, or a number that is divisible by 7 or 
contains digit 7, he have to say Boom! and the 
circle turns. Who mistakes, drinks, and starts 
a new round.

It gets really interesting after 5 or 6 rounds.