The Plaine de Plainpalais in Geneva was just reopened on the 1st of Augustus 2012, the National Day of Switzerland. Several exciting shows were organized to celebrate this event, and of them is the Cow Fight.
They made an arena and let 2 cows to the arena and let them fight. Some of the cows took a while before they start to fight, but some were quite aggressive and fight the other cow immediately. It was the first time I saw this show and I find it very interesting.