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There has been a bizarre twist in the cold case murder of an NYPD detective's daughter in Orange County. Following last week's celebrated arrest, a procedural mistake is about to set Megan McDonald's killer free, likely temporarily. Compounding the intrigue is the fact that the District Attorney in the case has now recused himself, due to conflict of interest.

Well, you don't see this every day. Unless you come back every day and watch this video again. But let's not get caught up in particulars. Let's just watch Jimmy Fallon's very successful mashup of Brian Williams clips that makes him rap the lyrics to 'Nuthin' But a G Thang' by Dr...