Deal with the Devil/Playing With

Basic Trope: A character sells their soul to Satan (or a similarly 'evil' or 'Trickster' mythological figure) in exchange for something.
 * Straight: Bob wants to be a millionaire and win the love of Alice, so he sells his soul to Satan to achieve this.
 * Exaggerated: Bob wants to be omnipotent ruler of the world, so he sells his soul and the souls of everyone he knows and loves to Satan.
 * Justified:
 * Old Mr. Scratch is very powerful and capable of granting any wish -- for a price...
 * Bob is an extremely bad situation and has to resort to this as a form of Deus Ex Machina (or, more accurately, a Daemon Ex Machina)
 * Inverted:
 * Satan tries to sell Bob human souls.
 * Bob sells his soul to The Big Man Upstairs.
 * Bob makes a deal with The Big Man Upstairs that he will release all his works into public domain in exchange for a complete lack of creativity block.
 * Satan tries to buy some much needed coal and pitchforks from Bob but doesn't have any money on hand.
 * Bob is the mightiest sorcerer in the lands, and coerces Satan into giving him his power in exchange for his aid.
 * Subverted: Satan offers Bob anything he wants in exchange for his soul. Bob decides it's not worth it and refuses.
 * Double Subverted: Bob succumbs to temptation, changes his mind, and ends up signing on the dotted line after all.
 * Parodied:
 * Bob is a lawyer, and forces Satan to a legally binding contract that ensues that it won't backfire on Bob in any way at all.
 * Satan and various other groups end up getting into a bidding war over Bob's soul.
 * Bob sells his soul for something ridiculously trivial, which he probably could have just gotten cheaply or for free anyway.
 * Deconstructed:
 * Bob is incredibly sympathetic, and sells his soul to save his dying wife Alice, despite knowing the cost to himself... but without a soul, he's a monster who kills her anyway.
 * Alternatively, Satan's obsession with pointlessly backstabbing everyone he deals with means that over time fewer and fewer people are willing to enter into deals with him, until he eventually runs out of the souls he needs.
 * Reconstructed: Bob sells his soul to save his dying wife, Alice. Without a soul, Bob becomes a monster for a moment and attempts to strangle Alice. However, his soul's good nature wins through and fights it's way free of the devil's grip and back to him. This earns the Devil's ire, and Bob has to deal with a curse of some sort - but he's happy as long as Alice is alive.
 * Zig Zagged: Bob is presented with the chance to sell his soul to Good Ol' Mr. Lucy and chooses not to do it, only to succumb to temptation later and seek Professor Pitchfork out, but when it comes right down to it, Bob just can't go through with it after all.
 * Averted: Bob doesn't make a deal with Satan.
 * Enforced: "We need to show how Bob's ambition makes him a bad guy. Have him sell his soul."
 * Lampshaded: Satan produces 'the standard contract' and remarks that he's been able to fine-tune it over millennia.
 * Invoked: Satan has been using his influence to nudge Bob into a position where he is open to making a deal in exchange for his soul.
 * Defied:
 * Bob is devoutly religious and refuses to consider the possibility of dealing with Satan.
 * Alternatively, Satan refuses to make the deal, telling Bob that if he's willing to make a deal with the devil, he'll probably be going to hell anyways.
 * *punt* Santa! not Satan!"
 * Discussed: Satan remarks that there's been a drop-off in people approaching him to make deals for their souls.
 * Conversed: "You'd think that people would suspect that making a literal deal with the Devil is going to end badly and be a bit more hesitant, but nope..."
 * Played For Laughs: After the deal, Satan takes pleasure in ensuring that Bob's deal backfires in as humourous a fashion as possible.
 * Played For Drama: Bob is gradually corrupted by his deal with Satan, being reduced to ever more vile acts of depravity and forcing Alice to find a way to try and void the contract with Satan.

Hey, you there. Want to get back to Deal with the Devil? Old Nick here will be happy to arrange it -- for a price...