Beer is one of the oldest alcoholic beverages, dating back to the 7000 BC. The alcohol content of beer commonly falls in the 4 - 6% bracket with very few exceptions. Since beer is made mostly from water, it has some versatility when making mixed drinks. It's used in a variety of cocktails, sometimes to accent the drink akin to a splash of soda, but often as a majority of the concoction. These drinks are often more enjoyed by those who also enjoy beer from the can.
Beer is created by fermentation of sugar from barley, sometimes using cheaper substitutes wheat, corn and rice or other. It is flavored most often with the flowering plant "hops" which acts as a preservative, lessens the sweetness of the beer and helps maintain the head created.
SYMPTOM: Don't recognize anyone, don't recognize the room you're in.
FAULT: You've wandered into the wrong party.
ACTION: See if they have free beer.
SYMPTOM: Floor moving.
FAULT: You are being carried out.
ACTION: Find out if you are being taken to another bar.