I never knew Brian Williams could flow. All these years he's been sitting behind the news anchor desk when he could have been dropping albums and poppin' bottles in the club, smh. 

The number of hours that went into editing this Tonight Show clip of Williams performing the Sugar Hill Gang classic makes my head hurt, and it's not the first time he's jumped in the rap game. Last year Williams covered "Nothin' But A G Thang." 

This 40's for you BW.