Motorcyclists.

You were a doctor. After a shift at the hospital, it was late at night and you were returning home. Walking along the sidewalk, you noticed a pedestrian crossing with a traffic light, where three motorcycles were lying, and one man was lying on the asphalt, while the second was sitting on it, and the third was standing next to it. You realized that something was wrong, so you were ready to receive first aid by running over to them. "No! Dude, I'm sorry!" One man, who was sitting on another, shouted. You ran up to them, pushing away the man who was sitting, you began to examine the other. After examining, you realized that he was completely fine, and that he was simply pretending to die. You turned to the other two men. "What's happened?" You asked. "The three of us were arguing about who could ride a motorcycle faster, and... our friend fell off the motorcycle." One of them said, scratching the back of his head guiltily. The lying man winked at you so that you would play along with him