get drunk when they watch something on tv, rugby match, or football, at home, with friends, in a pub or whatever ..... I don't understand !

i was talking with a friend on msn this morning, he told me he was so drunk yesterday after Australia/Ireland, each wall in Sydney was a danger, and i must say during and after every match he is like that, and he's not the only one, more when the Wallabies play of course ! I thought it was exactly when your favourite team plays you try to follow the match, if you're drunk, you can't follow and .... you don't even remember what's happened !!!! i saw a friend this morning, he told me he was on his way to meet some of his mates in a pub to watch NZ/Wales, ok, he's english but ... it's the morning, we're in France, and england wasn't playing !!!
So it's a man's thing, and i can't understand or what ?