Lyndon B. Johnson had a car that could go in and out of the water, and he would scare his passengers by driving into the lake, shouting, ‘The brakes won’t hold! We’re going under!’ One time, a guest panicked and tried to get out, so LBJ teased him nonstop, told everyone ‘He didn’t give a damn about his President. He just wanted to save his own skin,’ then laughed in his face the rest of the night. Source Source 2