There is a place in San Marcos called the Eskimo Hut. They serve alcoholic drinks to go. The drinks come in a styrofoam cup encased in a plastic bag. The consumer is provided with an oversized straw to poke through the bag to reach the contents. Products are thus consumed while driving - all of this is legal. Only in San Marcos would there exist a pronounced effort to circumnavigate the perfectly reasonable drinking while driving law. But the margaritas are good!