Oh, yeah: Brian Williams, Jimmy Fallon and The Roots slow jam the fiscal cliff

Struggling to understand what's going on with the debt ceiling and fiscal cliff? No worries, Allison Williams' dad, Brian (you know, that guy from Rock Center), stopped by Late Night with Jimmy Fallon this week to break it down for you. Ohhhhhh, yeahhhhhhh. Luckily, The Legendary Roots Crew lent a hand. Also, brace yourself for a slew of inuendos.