“When someone says something and then laughs afterward—even if it wasn’t funny—it’s a hint they’re enjoying the conversation. When someone makes noises as they listen (“Yeah,” “Uh-huh,” “Interesting”), it’s a sign they’re engaged, what linguists call backchanneling. When someone asks follow-up questions (“What do you mean?” “Why do you think he said that?”), it’s a clue they’re interested, whereas statements that change the subject (“Let me ask you about this other thing”) are hints they’re ready to move on.”