When Jack borrows a horn from Big Rig and lets everyone play with it, the trucks take it all over Trucktown to see who can smash out the best tune. This leads to damage to the horn and Big Rig’s trust. Luckily, Big Rig likes the new smashed sound.

Rosie gets a new balloon and the trucks spend their day trying to keep it from popping. Soon, the balloon loses air and the trucks think the fun is all over. But Jack invents a new game and the fun lifts off the ground again.

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