Shizuka's Acting All Goofy?

On the day of Shizuka's piano performance, Doraemon and Nobita were pranked by Gian and Suneo. Enraged, they decide to retaliate with the Timed Stupidity Bomb, causing mass havoc and destruction. However, when a bomb stupefies Shizuka and her mom, they are forced to race against time and prevent the bomb from messing with her agenda.