This is one of my favorite exchanges...
Doctor: Mr. Burns, I'm afraid you are the sickest man in the United States. You have everything.
Mr. Burns: You mean I have pneumonia?
Doctor: Yes.
Mr. Burns: Juvenile diabetes?
Doctor: Yes.
Mr. Burns: Hysterical pregnancy?
Doctor: Uh, a little bit, yes. You also have several diseases that have just been discovered - in you.
Mr. Burns: I see. You sure you haven't just made thousands of mistakes?
Doctor: Uh, no, no, I'm afraid not.
Mr. Burns: This sounds like bad news.
Doctor: Well, you'd think so, but all of your diseases are in perfect balance. Uh, if you have a moment, I can explain.
Mr. Burns: Well...
Doctor: Here's the door to your body, see? And these are oversized novelty germs. That's influenza, that's bronchitis, and this cute little cuddle-bug is pancreatic cancer. Here's what happens when they all try to get through the door at once...
Doctor: Woo-woo-woo-woo-woo-woo-woo. Move it, chowderhead. We call it, "Three Stooges Syndrome".
Mr. Burns: So what you're saying is, I'm indestructible.
Doctor: Oh, no, no, in fact, even slight breeze could...
Mr. Burns: Indestructible...