Skipper: Do you really think this is all in my mind, Professor?
Professor: Let's put it this way, Skipper. It's possible for an allergy to be psychological instead of physical.
Skipper: But that's ridiculous. I like him. Gilligan is a friend of mine.
Professor: But you do admit that he annoys you from time to time.
Skipper: But I don't dislike him. It's just that I'd like to kill him every now and then.
Professor: Well we'll soon find out. If the others file through and you're blindfolded and you sneeze only at Gilligan it will prove conclusively that you're allergic to him for physical and not mental reasons.