…Hi…I was watching the TV sitcom “The Big Bang Theory” yesterday and Peggy said to Sheldon: “Apples and oranges here Sheldon”! and I think that she wanted him to pay attention to her problem. Am I right?
It's Penny, not Peggy.
It means that they are talking about two very different things.
I love that show.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.