Tamagotchi Life/Death
BanDai America said that Tamagotchis do not die, but return to their home planet, because Americans can't take the concept of death as well as the Japanese.
A Tamagotchi's death, though, is somewhat complicated.
P1/P2:
Tama dies by skull. It stands still on the screen, beeping as the skull flashes. It starts to slow down, then lays an egg and disappears. Afterward, you see the death screen. Note that on P2, the Tama dies in its bed.
Angel:
Although the Angelgotchi is technically already dead, it dies this way: Tama waves goodbye, floats up, then bursts into stars (in japanese version, it scrolls to screen that says "thanks!")
Ocean:
In japanese, it dies into an underwater tombstone. In US, a submarine appears, saying that the Tama decided to experience the ocean on its own.
Garden:
In japanese, dies into a little bush tombstone. US version unknown, since it was scrapped.
Mesu/Osu:
Dies P1 style, death screen is a graveyard (at night, two ghosts appear)
TamaOtchi:
Drives away in a limousine.
Yaasachi (SP?)
Unknown
Plus/Connexion/Connection:
Japanese die and become grave. US and Europan fly away in a little egg with wings.
Keitai/Akai/Hanerutchi
Same as Plus, but can have an "Advanced Angel Death" where 2 angels fly your Tama away and a fancy new grave appears.
V2
Same as Connection/xion
Entama
Unknown
V3
Unknown
What happens after death
Dunno