Vocaloid! - Yondere XD!

Here are a few more examples of the Vocaloid "Yandere" theme.

Luka Megurine & Miku Hatsune - Kagome Kagome
Vocaloid - Alice Human Sacrifice (no translation) (With eng sub)

Kagome Kagome

(A type of ring-around-a-rosie game played by Japanese Children.

Try reading the comments under the Kagome Kagome video.)

These are REALLY CREEPY!

Less creepy or not at all:
 Daughter of Evil - Rin Kagamine
Servent of Evil - Len Kagamine
Trick or Treat - Rin & Len Kagamine (KHR ver with Chrome & Mukuro) (Kyaaaa! XD)

Enjoy! :)