You should be patient with children.
Remy is teaching a course on self defense for children in a kindergarten class.
Remy wants the children to pay attention to him.
Remy creates a reward system for students in the course who are especially quiet and attentive.
Remy whistles loudly and tells the children he will cancel the class entirely if they don't listen to him.
Most of the students participate actively in trying to earn rewards, ensuring class attention.
The children's parents are displeased with Remy's discipline method and withdraw their children from his course.