Face Heel Turn/Playing With

Basic Trope: A good guy turns into one of the bad guys.
 * Straight: Bob turns to The Dark Side to defeat his worst enemy, and stays that way.
 * Exaggerated: Bob turns to The Dark Side to help him win a one dollar bet, and gleefully speeds across the Moral Event Horizon shortly thereafter.
 * Justified:
 * He got Drunk on the Dark Side.
 * The villain made him an offer he couldn't refuse.
 * Bob was thrown over the Despair Event Horizon.
 * Inverted: See Heel Face Turn.
 * Subverted: He's only pretending to turn to evil, to find out what the bad guys are planning.
 * Double Subverted: When Hiro confronts him on his turn to evil, Bob says he's only trying to find out what the bad guys are planning. He's lying. Or he meant to, but starts Becoming the Mask.
 * Parodied: Bob turns to The Dark Side entirely because Good Is Boring.
 * Deconstructed:
 * Bob turns to The Dark Side, but in doing so becomes a Fallen Hero who finds out painfully that Being Evil Sucks.
 * It is revealed that he has ulterior motives beyond good and evil for working for The Dark Side, believing that they will better help him accomplish his goals.
 * Reconstructed: Now realizing evil sucks, Bob tries to atone for what he has done, but is promptly rejected and bitterly embraces his fallen status.
 * Zig Zagged: See Heel Face Revolving Door.
 * Averted: Despite occasionally having to Shoot the Dog, Bob remains good.
 * Enforced: "We need a new villain. What if a hero turned against his fellows?"
 * Lampshaded: "You've gone over to The Dark Side? After all the times we've crushed them? Really?
 * Invoked: The villain knows Bob's weaknesses and plays on them in a Hannibal Lecture to cause him to go to The Dark Side.
 * Defied: "You're not going to get me to betray my friends with a mere offer of money or whatever."
 * Discussed: "You don't need to worry about Bob forgetting which side he's on- he knows exactly what he's fighting for."
 * Conversed: "Is this the episode where he turns into a bad guy?"

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