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See Also: Black Box, for situations where the device in question has extraterrestrial or otherwise fantastic origins that would justify not being able to build another The Spark of Genius, for devices that have the superficial trappings of science but are actually based on powers that don't follow the usual scientific rules of predictable cause and effect It Only Works Once, for devices that can't effectively be reused even if you know how to make them work again and This Page Will Self-Destruct, for cases where the plans and/or prototype are deliberately destroyed to prevent them from being used again. It may appear as a justification for Never Recycle Your Schemes. Compare Reed Richards Is Useless, where the formula exists, but is only applied to fantastic problems. but there's nothing to stop them building another." Or the superweapon hadn't actually been destroyed as they thought.Ī common cause of this is Shoot the Builder.

Occasionally subverted after the customary celebration of the superweapon being destroyed, with one hero ominously pointing out, "yes. Nor does it apply when the experiment results in a Psycho Prototype in these cases, the researcher will make changes to the plans and build a second, "good" version, to fight the first, "bad" one (of course, the trope may kick in right after that.). In this case, the remorseful researcher does keep notes, which he will either attempt to burn or erase himself, or will ask the heroes to destroy for him.

This trope usually does not apply when the scientist who designed the technology is treated as a sympathetic character.
