At first, there was no seat belt in the car, but once a man was in a hurry, he didn't put his backpack in another place when he got on the bus, and because he was in a hurry, he hung it on the seat by mistake. Because he was in a hurry, he ran a red light at an intersection and a car came in the other direction. He braked suddenly, and the backpack belt hanging on his seat pulled him, but he was only slightly injured. It is precisely because of this that I have the inspiration of seat belts!