Which of the following is a visible sign that a guest may be disappointed?

A honking horn is a visible sign that a guest may be disappointed because it typically indicates frustration or a desire for attention. When a guest honks their horn, it often shows that they are not receiving the service they expect, which is often associated with dissatisfaction. This action draws attention to the fact that something is not right, whether it's a delay in service, an error with their order, or a lack of interaction from the staff. Recognizing such signs can help staff respond promptly to resolve any issues and improve the guest's experience.

In contrast, looks of joy, smiling faces, and clear communication generally denote a positive interaction and satisfaction with the service provided.