WATCH: Jimmy Fallon Does Justin Bieber Better Than Bieber

When Jimmy Fallon's on, he is ON. And in case you needed a reminder of how and why, observe his GENIUS Justin Bieber impression in this video spoof from "Late Night With Jimmy Fallon."

From the prototypical purple hoodie, the requisite Bieber hair swoop, carefully coordinated high-top sneakers to... Justin Bieber's deep reflective thoughts on... the housing bubble and the TARP bailout... Jimmy IS Justin.

Watch Jimmy Fallon as Justin Bieber calling out the former chairman of the Federal Reserve, Alan Greenspan (aka SENTENCE I NEVER THOUGHT I'D WRITE), in this video from "Late Night With Jimmy Fallon."