Lacking any knowledge of chemistry, prehistoric humans eager for the intoxicating effects of alcohol apparently mixed clumps of rice with saliva in their mouths to break down the starches in the grain and convert them into malt sugar.

These pioneering brewers would then spit the chewed up rice into their brew. Husks and yeasty foam floated on top of the liquid, so they used long straws to drink from narrow necked jugs. Alcohol is still consumed this way in some regions of China.

from: http://www.spiegel.de/international/zeitgeist/0,1518,668642,00.html