Your wife wants you to go to the dentist. She's told you to make an appointment several times in the last few weeks. She tells you again. You're annoyed that she keeps telling you what to do, so you tell her to stop.
Quit nagging me!
You're a hair dresser. You're talking with a customer while you cut his hair. You ask what he does, and he says that he's a lawyer. You tease him about it.
You're in charge of a meeting at work. You say this to get the meeting started.
You've organized a party at a restaurant for a friend of yours who's moving to another part of the country. You want to officially say some nice things about your friend. You say this once you've gotten everyone's attention.