First my older daughter's fourth grade friends gave her a Tamagotchi and soon after my younger first grader also wanted one and we relented. She then convinced several of her first grade friends that they needed them which caused some parents to call us mostly because they got these Tamagotchi and nobody could figure out how to work them. My first grader is giving out lessons tomorrow.
These devices beep when they need attention—food or playing or needing cleanup after an "accident". Don't attend to them and they will die. My kids pay constant attention to the Tamagotchi and it is sometimes hard to bring them back to reality. My youngest, a couple of days ago, got all excited when her Tamagotchi learned to go to the bathroom by himself. It didn't seem like all that long ago that I got excited about the same thing for her.
Luckily young kids are fickle and the Tamagotchi craze will soon pass. But move over Godzilla, the scariest monster from Japan is a friendly looking creature in a plastic case.