Which of the following bar practices should be avoided?

Dunking the faucet in beer while pouring should be avoided because it introduces the potential for contamination and affects the cleanliness of the draft system. When a faucet comes into contact with the beer it dispenses, it can pick up bacteria and other undesirable substances that could compromise the quality and safety of the beer. Moreover, this practice can lead to unwanted sediment or foam in the glass, impacting the overall drinking experience for customers.

Serving warm beer, piling glasses too high, and pouring beer too quickly also present various issues, but the act of dunking the faucet is particularly problematic because it directly relates to hygiene and the integrity of the beer being served. Ensuring that both the equipment and the beer remain clean and uncontaminated is crucial for delivering a high-quality product.