Death Note

Ryuk: You have lost, Light. Didn't I say in the beginning, when you die, the one who'll write your name down in a notebook will be me. That is the deal between the Shinigami and the first human to get their hands on the note in the human world. Once you enter prison, I don't know when you'll die. It's annoying to wait. Your life is already over. You'll die here.

[pause]

Ryuk: Well, it was good while it lasted. We killed some boredom, didn't we? We did some various and interesting things.