Once in the MRT train, an old man sitting nearby was dozing off. He seemed to be a little bit drunk. His face was red, and he also looked tired. The next second, he suddenly fell forward with his head directly on the ground, but he did not get up immediately. Everyone was in shock. The entire carriage seemed to be frozen, and there was no sound. Maybe two or three seconds later, the girl standing next to me suddenly shouted “Alarm bell! Hurry up!”. I suddenly thought that the social psychology class I took told me that usually in this situation, everyone is in a state of panic, and when they don’t know what to do, they will assume that someone is about to help. So, everyone will choose to be a bystander. If no one demands anyone to do something, or if he/she takes the initiative to help, everyone will stand there and does nothing but see what’s going on silently. The place where I was sitting was far away from the alarm bell. I immediately stood up, pointed at the shocked female passenger standing near the alarm bell, and yelled at her: “The one over there, please press the alarm bell.” The girl reacted immediately, rang the alarm bell, and told the station staff that someone had fallen in the carriage. The station staff also came to assist immediately, check that the old man was injured, and gave him the help he needed.