"Bernard" is a vocal game in which you get in a circle and the first person whispers bernard, then the next person in the circle has to say bernard but slightly louder... this continues until people are shouting bernard as loud as possible.
Drinking is incorporated into this game, if somebody decides not to shout bernard louder than the person before them, they must finish the rest of their beer. This game works best in a quietish bar or pub, as it's more embarrassing and will attract the attention of any irate bar staff or other customers.
Another variation is to use different words. C*NT has worked well in the past but is best done when the group had a few to drink before hand.