Click the boss
One time at a conference I shared a breakfast table with a woman who was an executive in an oil company. Finding out what I do for a living, she expressed a firm belief in reinforcement, and told me the following story.
She had a mean boss. He was brutal: blaming, finding fault, belittling, angry. Everyone was alarmed to see him come into their office and glad to see him go, including the woman who was telling me the story.