It's patent pending design allows for the sharing of liquid (preferably beer) between the two mugs.But the combinations of uses are only limited to your imagination.Put ice tea in one side and lemonade in the other for a fun Arnold Palmer.How about some vodka on one side and bloody Mary mix on the other for...well, a Bloody Mary! Perfect for tailgating, parties and hanging out in general, you will be the hit of the event with the Two Fisted Drinker Beer Mug.