I used to be able to take care of five Tamagotchis at once. And when one would die, there’s a site I would go on that was specifically meant to lay a grave plot, set flowers, and write a goodbye message to your little guy.
This song. It’s not as much a nostalgic thing, but it never stopped sending me into a nostalgic trip just by listening to it and coming back to it, the feeling is not lost at all. :)