The seiyuu playing Light Yagami (or Yagami Raito) in Death Note is the same seiyuu for... Tamaki from Ouran High School Host Club.
Consider my mind officially fucked. I now have images of Tamaki going, "Oooooh, a notebook of the COMMONERS!" You know the first thing he'd do is write his own name in it.
On a similar note, Misa from Death Note also did Suzumiya Haruhi.