Which of the following is NOT a rule associated with black comedy?

In the context of black comedy, the emphasis is often on blending humor with serious or taboo subjects, which can include themes that are dark or grotesque rather than lighthearted. The essence of black comedy lies in its ability to subvert traditional comedic norms by addressing uncomfortable topics, making audiences laugh at things that are typically serious or distressing.

Characteristically, black comedy does not prioritize a lighthearted approach; rather, it often highlights the absurdity or tragedy of life. By doing so, it provides commentary on social issues or human behavior, which aligns with the nature of its humor. Therefore, stating that humor must be lighthearted contradicts the fundamental principles of black comedy, which thrives on a more complex and often darker exploration of comic elements.