I hate when you say, "What?" after not hearing someone, and their response is, "You heard me." If I heard you, buddy, then why would I ask what?!?!?!? I get this response all the time, too.
I love this one PERSON: HOW YOU DOING? You: Sickly and poor PERSON: GOOD GOOD!! I usually try to say something to upset the programmed response Rocket River pass me another SCREAMING VIKING