Ichi The Killer:
Ichi The Killer, Takashi Miike, 2001. The not titular killer, Kakihara is a sadomasochistic yakuza enforcer who finds the titular, very damaged and psychotic, Ichi, while searching for his missing boss. In Ichi, Kakihara finds the pain he has been longing for.
Misery:
Misery, Rob Reiner, 1990. Writer Paul Sheldon meets his number one fan, Annie Wilkes, who gives him the artist residency opportunity of a lifetime.