By no means an exhaustive list.
  1. Liv goes undercover
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    Bonus points to the episode where she's a madame wearing a mink. Most favorite.
  2. He said-she said, no resolution
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    One of these is literally called "Doubt." Least favorite.
  3. Elliot takes off his shirt
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    Extra special when he's also not wearing pants or when combined with #1. Most favorite.
  4. Elliot has rage
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    The tiny trees in the diorama his dad smashed! 😭 A lot of overlap with #3. Most favorite.
  5. When they can't make the case
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    Rare, but always unfortunate. I am watching TV for catharsis, not reality. Least favorite.
  6. Finn sticks up for his gay son
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    I'm not acknowledging the times when he isn't cool with it. Most favorite.
  7. Cragen gets in trouble
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    He reminds me a lot of my dad 😕 Least favorite.
  8. Munch is left in charge for the next episode
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    Only thing that is not sad about Cragen being in trouble. Most favorite.
  9. Related to the Colombian gangster who tries to kill Alex
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    But she's ok and she's going into witness protection and then she comes back to testify against him and her lover in witness protection whispers Emily into her ear oh man. Most favorite.
  10. Ones that involve Ludacris
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    His character is sketchy as fuck and he gets everybody in trouble, including Cragen. Least favorite (though that is a sick jacket, Luda).
  11. BD Wong saves the day
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    Ugh, such a role model. Would never know about ibogaine without him. Most favorite.
  12. Dani Beck as a supposedly valid character
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    Lol at her whackadoo accent and her couch on fire. Least favorite.
  13. Extra-super topical
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    Plus-minus. Depends on the story.
  14. Involving Elliot's children acting a fool
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    You know, driving drunk or being anorexic or having a dead druggy friend. Though one time that did get us a picture of Elliot as a carrot. Still. Least favorite. **NOTE: This does not include the episode where Olivia helps deliver Kathy's baby. That one's the best.
  15. Sneaky guest stars before they were famous that you only now recognize
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    Lookin at you, cast of Grey's Anatomy. Most favorite.
  16. Big name guest stars to draw an audience
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    This led to the best episode ever, where Ice-T gets to interrogate his wife and at the end, everybody goes to Red Lobster. Most favorite.
  17. Sonya Paxton's reign of terror
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    Never redeemed after slapping Elliot, as hard as they tried. Least favorite.
  18. Extra punny ones
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    Tbh, that's kind of all of them. Most favorite.
  19. Liv and Elliot are wildly out of their depth
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    These are always ridiculous, often involve threats to national security or hilarious sudden promotions to federal agents or flying to other countries. Most favorite.
  20. Post-Stabler, post-Munch, post-Cragen
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    Not even dignifying this with a rationale. Least favorite.
  21. The type I'm on!
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    Suggested by @videodrew