Revellers scuffle for the first free beer in the traditional 1-litre beer mug at the opening of the world's biggest beer fest, the Munich Oktoberfest, at the Theresienwiese in Munich, September 17, 2011. [Photo/Agencies]

A waitress carries the traditional 1-litre beer mugs at the opening of the world's biggest beer festival, the Munich Oktoberfest, at the Theresienwiese in Munich, September 17, 2011.