You've been there and you know it: beer in one hand, at the start of the buffet line. What do you do? If you tuck it under your arm, you run the risk of spilling it. If you leave it on a table, you might get germs from some mooching stranger. You could always struggle with the plate and utensils all in one hand, but that can spell disaster for your beverage.
Finally a solution to the buffet dilemma: these. Someone in the design department had a beer or two and thought of us serious drinkers at the picnic.