To help you find the right film, I'd like to understand what aspects of this theme you're most interested in. Are you looking for a:
* Classic horror film: This could include "The Devil's Advocate" (1997) with its chilling portrayal of a charismatic devil, or "Rosemary's Baby" (1968) with its unsettling exploration of pregnancy and evil.
* Modern take on the theme: Perhaps "The Ninth Gate" (1999) with its complex plot involving a rare book and demonic possession, or "The Conjuring" (2013) with its focus on real-life paranormal investigations.
* Dark comedy: "Bedazzled" (2000) offers a humorous take on the deal with the devil, while "The Devil's Advocate" can also be interpreted as a black comedy in parts.
* Philosophical exploration: "Waking Life" (2001) uses animation to explore the nature of reality and the choice between good and evil, while "Angel Heart" (1987) delves into the darker side of human nature and its connection to the supernatural.
Once you tell me what kind of movie you're looking for, I can give you a more specific recommendation!