What are some examples that illustrate the differences between act and rule utilitarianism?

One example that illustrates the differences between act and rule utilitarianism is the scenario of lying. In act utilitarianism, an individual would consider lying acceptable if it results in the greatest overall happiness in a specific situation. However, in rule utilitarianism, lying is generally considered wrong because following a rule of honesty tends to lead to greater overall happiness in the long run.