Doraemon (1979)
A Rumor Without Root (24x28)
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When Gian and Suneo spread a rumor that Nobita is taking the school carrots to feed Doraemon, both him and Nobita use the Rumor Without Root gadget to take revenge on them. However, Shizuka still believes the rumor that Gian and Suneo spread, and Nobita accidentally misuses the gadget to make it such that he's friend to all animals causing all of them to invade his house.