In Tamagotchi! Yume Kira Dream episode 25, Mametchi tries to build a robot duplicate of Cafe Mama's husband for her birthday, complete with recorded dialog. While he's recording his voice, Patitchi overhears him and thinks Mametchi is confessing his love to her.
In the same episode, Kiraritchi doing the robot.
In Tamagotchi! Yume Kira Dream episode 26, while riding Himespetchi's ship, Pianitchi, Yumemitchi and Kiraritchi ask Mametchi to sing. Mametchi's singing is so awful that it crashes the ship.
Kuchipatchi fattening himself up into a ball in episode 1 of Go Go! Tamagotchi. His squeals of joy while rolling around are priceless.