When people drink alcohol, it can affect their behavior and thinking. Many people become loud and rowdy, and may do or say things that they wouldn't normally do when sober. They may also become more aggressive and emotional, and have impaired judgment. Friends who are drunk may also have slurred speech, difficulty walking, and a lack of coordination. Keywords: Alcohol, Behavior, Thinking, Loud, Rowdy, Aggressive, Emotional, Impaired Judgment, Slurred Speech, Walking.