Removed the Voodoo Shark entry. It doesn't fit because there's not one single non-sensical reason for Aaron Echolls' aquittal. It was a collection of Idiot Balls (from Logan on down) and You Fail Law Forever contrivances, not one "Better Off Not Knowing" answer.

Removed Very Special Episode, as the original troper didn't name it, I couldn't think of one, and a quick google search didn't turn up anything. Some of the plots deal with troubling topics, but they all fit in the show's framework and don't qualify as very special. Feel free to add it back if you can identify the episode.