Ep. 10: Nobita recibe de Doraemon una pistola que altera la suerte y dispara balas rojas y negras.

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Nobita has some bad luck so Doraemon gives him a gun which shoots red bullets (actually bursts of light) for good luck and black bullets for bad luck, but no way of deciding which you get. Cowardly Nobita has 3 others try it first and they all get good luck. A little boy takes the gun and shoots Nobita with a black bullet and he gets all bad luck. (Source: Wikipedia)