Sheldon: Try to put yourself in my place. Imagine you're the sole human being living on a planet populated with nothing but dogs. And then it turns out there's another human being.
Howard: Hang on, are you saying the rest of us are dogs?
Sheldon: Okay. I can see you're going to take this the wrong way. Let me try again. Imagine you're the sole human being on a planet populated with nothing but chimps.
Howard: Get out of my lab.
Sheldon: Oh, now they're much smarter than dogs. Have you seen them on those bicycles?
Howard: Get out.
Sheldon: How about dolphins?