In managerial accounting Standard costs part,

In the text book, It says that standard costs has the potential problems that "If variances are misused as a club to negatively reinforce employees, morale may suffer and

employees may make dysfunctional decisions."

SO what is this " morale may suffer and employees may make dysfunctional decisions."

Can you explain with example?

I want to know exact example and explanation in managerial accounting part