iHear / Switch Witch.iHear: After Alvin's phone is confiscated, he manages to convince Simon to lend him an experimental nanophone that Simon invented to replace it. However, the nanophone is soon damaged and it develops the ability to listen to everyone else's phone calls. Alvin then starts telling everyone the info he gathers and Brittany and Simon decide to strike back at him by tricking him into believing that his head will explode if he keeps using the nanophone. In a fit of panic, Alvin destroys it and does not even want to get his original phone back once the punishment is lifted.
Switch Witch: The day after Halloween, the Chipmunks' and Chipettes' candy harvest is stolen. They get convinced that a creature called the "Switch Witch" took them and after some investigations, they think Ms. Croner is the witch. They follow her to a cabin in the woods, where it is revealed that it was a setup by Dave and Ms. Croner in order to make their Halloween funnier.