The jazz music plays and you snap you fingers to the beat. After only two snaps the entire place goes silent and the crowd stares angrily in your direction. The bandleader stands up and walks over toward you. He grabs your hand and holds it in front of you face. "You see this?" he barks, "We’ll have none of this in here!" He holds your hand up for an uncomfortably long time then lets it fall. He then returns to the bandstand to continue the music.