What should you offer a guest who orders a Hairy Mexican?

The correct choice in this context reflects the playful nature of the drink's name, "Hairy Mexican," which indicates that the bartender should respond with humor to the order. In this case, offering a "Hairy chin" aligns well with the whimsical naming and adds an element of fun and engagement with the guest. This approach not only acknowledges their order but also enhances the dining experience by fostering a light-hearted atmosphere.

The other choices, while they may carry a similar playful tone, do not connect as directly to the common associations that might come with the term “hairy” in a fun and light-hearted context. "Hairy chin" seems the most fitting response, as it's a familiar physical trait that guests may find amusing.