Martin heard the laughter and voices out on the street when he walked to the apartment of his cousin Guy, who was celebrating his 21st birthday. Martin felt stressed and wanted to turn around and go home. He did not know why. He walked to the door and rang the doorbell. There was no response. He rang again. Now the buzzer sounded, Martin pushed the door open and walked to the second floor. When he opened the door, a group of his peers laughed and turned to where Martin stood hesitant. Martin felt a rush of anxiety.