Several centuries/millenia ago, MC was given the job of ending the world/stopping the end of the world by [date]. But she's like most of us, so she procrastinated. Now there are only days/weeks left to finish her project, and she hasn't even started to make plans.

A defense attorney uses John Amsterdam's "eccentricity" against him while he testifies against somebody he arrested.

Dexter Morgan, not a serial killer.  Nothing out of the ordinary about him.  But then one day, he comes home and finds a dismembered Barbie doll in his freezer, connects it to the Ice Truck Killer, and is all D: about it.

The GCPD amasses a large body of evidence that Bruce Wayne is Batman, enough that there's no doubt in anybody's mind.  But he's really convincing with his denial, enough so that they start to become convinced that he has DID.  Eventually he breaks and admits it all.

Patrick Jane on truth serum (or anything else that destroys his verbal inhibitions): most horrifying thing ever, or what?  Throughout the show we keep getting shown how he has a tendency towards saying things that he shouldn't, hitting where it hurts; I get the impression that he only holds off in regards to the team (as far as that goes, anyway) because a) he likes them and b) he's using them to get to Red John, but that doesn't mean he isn't gathering all sorts of information about them that would come spilling out in that kind of situation.  It would end VERY BADLY.  Or possibly everybody would be used enough to him that they could get over it.