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Dethroning Moment: CSI: Crime Scene Investigation
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Hamburger Time: The ending of the episode "Fracked". The team thinks they've finally put together what's going on with the gas company (one of their employees was killing whistleblowers, then the company had the killer killed for outliving his usefulness), when, out of nowhere the sleazeball Undersheriff closes the investigation. Yeah, the episode was probably trying to make a point about the "untouchability" of corporations, but all it did was suck any sense of satisfaction out of an otherwise passable episode. I've even grown an epileptic tree about this episode: the Undersheriff was bribed.
A Black Raptor: The ending of the episode where Langston and Lady Heather meet. This turns Langston's Crowning Moment Of Awesome from a previous episode into nothing. Previously, Langston was able to turn the 'genetically predisposed to being a psychopath' theory on its ass by revealing that genetically and historically, he's a lot like Nate Heskel: He has the same gene and he had an abusive childhood, but he's still not a serial killer. That was an awesome moment. But then, in this episode, he confesses to Lady Heather that he feels 'a monster' inside of him, and feels he needs to kill Nate. Ok, so, you give a middle finger to a previous episode's very awesome ending by making it clear that actually, he is really a serial killer waiting to happen. Great way to make it apparent that being a Complete Monster isn't by choice writers. What makes it more infuriating, was that the previous moment was what saved Langston from being my least favorite character, so not only do they remove an awesome moment's credibility, they remove the one thing I liked about Langston.
Chicago Mel: For me, it was "Forget Me Not". They admittedly had issues when Jorja Fox returned after her departure. But though things seem ok the previous season, they're split up in this episode. It comes across as Sara being stupid and staying put instead of putting her marriage first. Plus, the writers were so afraid of the fans asking to see Grissom if they said he was in Vegas, even though many fans say it would have been just fine.
Anarquistador: The episode "Sounds of Silence", featured Sara and Warrick being unforgivably - and uncharacteristically - rude to a deaf person in the course of their investigation. You could cite ignorance of the deaf community as one of the factors, but it's just simple courtesy to not ignore the person you're talking to in favor of the translator (and you'd think the translator would at least make them aware of this before they started their interview). The whole situation seemed to be designed purely as a setup for the reveal that Grissom knows sign language, and it just seemed like there could have been a better way to do it other than having our characters pick up an Idiot Ball.