Breaking conversational rules causes laughter

The conversational rules for a successful invitation depend on:

• who we're asking,
• what kind of relationship we have
• what's at stake
• how important an acceptance is.

The preferred response to a request is acceptance, and the best way to ensure a positive result is to pose a leading question like, "What are you up to this evening?" This helps those we're talking to avoid having to give negative responses.

Friends' scriptwriters breached these rules, which cause audiences to laugh.