Japan introduced the Tamagotchi to the U.S. in 1996 and it instantly became a crazy ‘90s fad. Though you had to wait for like five minutes for it to hatch, once it did you could feed it and play with it just like a real pet. If you left it alone, it would poop a lot and die. Thanks to Katy Perry and Orlando Bloom's matching Tamagotchis at the 2016 Met Gala, they could even be making a comeback.
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Credit: Mashable