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.
Toys
Some items have effects that are funny to watch:
One-time use items have many different outcomes. The chest item may turn the pet into a baby or an senior, and the pet is apparently not very happy about this. This will drain all of the pet's happy hearts, but the animation itself is hilarious. Similarly, the Genie from the lamp might call up a storm to ruin your Tamagotchi's mood.
The boot item makes the Tamagotchi wear an oversized pair of boots.
The RC Car on the V3 can sometimes flip over, causing the Tamagotchi to be frustrated.
The sequence of saving the pet from dying in colored models usually includes summoning an ambulance to drive them to safety. The Grim Gotchi will then try in vain to chase or stop the ambulance, only to be subdued, or run over, before being taken back to the sky by Chestnut Angels.
In the iD and iD L, after marrying another Tamagotchi and having a baby the Tamagotchi adult will play with the baby until it falls asleep and secretly leave. On the P's though the baby wakes up just before the adult is able to leave and happily bids goodbye to the adult.
In the Smart, Shirotama will sometimes visit the player in their backyard. Some of the possible gifts are a picture of Oyajitchi or an Oyajitchi plush, which every pet dislikes. Not even Melodytchi, a fan of Oyajitchi likes them!
The Birthday party in the Smart has your pet being caught preparing for a surprise for you. It then angrily tells you to get out before calling you back in, and you watch it eat a whole birthday cake on your birthday.
In the Uni, when you first scroll though the rooms, you may discover a cute animation of your Tamagotchi playing with the lid of the stool. It becomes funnier when your Tamagotchi grows up and still does that.
Also in the Uni if your pet's happiness is low they'll unhappily lie in the corner, and toss all their accessories around the room if they have any. Even better, if you get the sitter at this time, they'll lie there as the sitter smiles in the background!
A care icon in the Uni basically requires you to get your pet on the verge of dying, and call the ambulance, making this an unintentional Achievement Mockery since if your pet would die, it means that you are either doing a really bad job at taking care of them or are abusing them.
