The Audio Speaker Phone

Nobita, having scored zero marks for his test again and with the teacher wanting to talk with Mom about that, returns home to find Doraemon chatting with another cat. It turns out that the cat has been bullied, so he uses the Audio Speaker Phone to make the cat stand up to the bully, and explains how bullying is not good.

Nobita then steals the gadget to make the teacher say nice things about him to his mother, and tell her to increase his allowings for reward. He also uses it to prank Suneo (who tells bad things about Gian, and later gets punched in the face) and Gian (who tells bad things about his mother). Later, Doraemon snatches the gadget away from Nobita and makes him tell the truth about Nobita scoring zero marks for his test, which angers Mom as a result.