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The act of putting forth a stupid, inane or otherwise impractical comment or idea that inadvertently gives rise to a much better and more valid idea. Frequently used in a contrived fashion in movies and TV shows to give the main character a means of overcoming a previously impossible problem or challenge.
In the movie Independence Day, Jeff Goldblum gets a moment of dumbspiration when his father warns him to get up off the floor before he catches a cold, thus giving him the idea of using a computer virus to stop the previously invulnerable alien invaders.
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