A man wanted to test the lights on the back of his car, so he asked his friend for help. First he turned on the lights, and asked, “Are the tail lights working?” The friend responded, “Yes they are.” Then he hit his brakes and asked if the brake lights were working, and the friend responded, “Yes they are.” Next he tried his turn signal and asked, “Is the left blinker working?” To which the friend replied, “It is… It isn’t… It is… It isn’t… It is… It isn’t..