Which behavior indicates a server should cut off a patron from further service?

The behavior that indicates a server should cut off a patron from further service is when the patron is becoming excessively rowdy. This type of behavior is often associated with higher levels of intoxication, which can lead to disruptive actions that affect the safety and comfort of other patrons and staff. Excessive rowdiness can signal a loss of control, and it is essential for servers to intervene in such situations to promote a safe environment and prevent potential incidents that may result from aggressive or unruly behaviors.

In contrast, quietly sipping a drink suggests a calm demeanor that does not warrant cutting off service. Loudly celebrating could be within acceptable limits, particularly if it does not escalate to disruptive behavior. Engaging positively with others typically indicates that the patron is enjoying themselves in a respectful manner, which does not necessitate intervention. It's the excessive rowdiness that stands out as a clear sign that further service should be curtailed to maintain a safe and enjoyable atmosphere.