Mac Lethal, the insanely fast rapper who's rapped about everything from breakfast to classified ads, puts his quick tongue to work breaking a world record rapping about Santa.
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...