Lyndon Johnson’s secret service agents were also his personal relay team of traveling bartenders. They often trailed him in a station wagon while he drove his convertible around and drank scotch out of a big foam cup. Periodically, he would slow down, hang his arm out of the car, and shake his cup- then an agent would jump out, grab the cup, hand it off to an agent inside the wagon, wait for a refill, and run it back to LBJ, whose arm was still outstretched and waiting.