The Coagulation Light

Nobita and Doraemon use the Coagulation Light gadget so that they can freeze the rain and prevent the clothes from getting wet. They later use it to save Gian and Suneo from a forest fire. However unbeknownst to them, they accidentally used the gadget to freeze Shizuka's bathtub while she was taking a bath, which she later finds out and is furious with them.