Many reasons. To the point of darkness because it's a thin line between a light buzz and over-the-top-cannot-even-say-my-name
> Why is this so common?
human nature. Not only human, actually, monkeys drunk on fermented fruit, etc [1]
> Has this always been the case?
Yes
> Will this change?
No.
[1] http://www.australiangeographic.com.au/topics/wildlife/2011/...
[1] http://www.dailymail.co.uk/news/article-2229334/Fifty-drunke...
Many reasons. To the point of darkness because it's a thin line between a light buzz and over-the-top-cannot-even-say-my-name
> Why is this so common?
human nature. Not only human, actually, monkeys drunk on fermented fruit, etc [1]
> Has this always been the case?
Yes
> Will this change?
No.
[1] http://www.australiangeographic.com.au/topics/wildlife/2011/...