You remember Tamagotchi. They are/were the little keychain pets which you had to feed and play with and clean up after and allow to grow and evolve and eventually go to the Land Where Tamagotchi Are Eternally Blessed. Apparently, as with all things Japanese and electronic, there is a sizable internet subculture around electronic pets. I actually found a few built in Flash including Godzilla and Charles Manson, but you can go looking for the CM one your own damn selves.
Anyway, when I am done creating my little Tamagotchi I will post it for your Viewing Pleasure.