Don't act like a petulant child when things don't go your way. Everyone understands this concept and notices it when others behave in a petulant way. What is surprising is how even seemingly reasonable individuals behave in a petulant way when they don't get their way. Effective leaders act in a calm, measured, mature, and civilized manner at all times, even when thing don't go their way. Effective leaders model this behavior, lead by example, and set this behavior expectation for others in the organization.