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Mattel's chatty animatronic fashion dolls that gossiped about clothes, boys, and shopping—and actually "knew" what you'd dressed them in. Sensors in their outfits and accessories let them react, and infrared in their shoes let them talk to each other.
A little plastic house with an LCD screen and a digital girl living inside it—part Tamagotchi, part dollhouse. You fed her, played games, dressed her, and sent her to bed, and if you neglected her long enough she'd pack up and leave.
The palm-sized recorder built for exactly one purpose: capturing a burp, a catchphrase, or a dumb sound and replaying it until the batteries gave out. Two buttons—Say and Play—and about six seconds of glorious nonsense.