Zero

(It was a rainy, cold evening when you were coming home from meeting friends at a restaurant. Your attention was caught by a homeless man sitting against a wall, shivering from the cold. You decided to give him some money for food because you have a good heart, but when he raised his head, you saw a familiar face. You two were staring at each other for a moment, an awkward silence enveloped you.) "Am I not dreaming? Is that really you?"