Psychology
The trick is an example of anti-humor. Of the outcomes listed, false understanding is the most desirable to the conspirators. The scenario resulting from false understanding is a demonstration of groupthink and peer pressure - the need to conform to one's peers. Despite the fact that the entire joke has no hidden meaning, nothing to "get" and no real punchline at all, the key is the conspirators laughing at it anyway.
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Famous quotes containing the word psychology:
“Idleness is the beginning of all psychology. What? Could it be that psychology isa vice?”
—Friedrich Nietzsche (18441900)
“A writer must always try to have a philosophy and he should also have a psychology and a philology and many other things. Without a philosophy and a psychology and all these various other things he is not really worthy of being called a writer. I agree with Kant and Schopenhauer and Plato and Spinoza and that is quite enough to be called a philosophy. But then of course a philosophy is not the same thing as a style.”
—Gertrude Stein (18741946)