Doraemon (1979)

S01E10 Lucky Gun

Nobita is feeling particularly unlucky, prompting Doraemon to gift him a unique gun that fires red bullets for good fortune and black bullets for misfortune, though the outcome remains a mystery. Fearful of the consequences, Nobita watches as three friends test it out, all experiencing strokes of good luck. However, when a young boy takes the gun and accidentally hits Nobita with a black bullet, he suddenly finds himself engulfed in a wave of unfortunate events.