Which One is the Real Morgan Freeman?

Continuing on with celebrity impersonations, this is a hoot.  "Jeff the Robot" on Craig Ferguson's Late, Late Show does an amazing Morgan Freeman -- with Morgan Freeman there as a guest.  The best part of this is the reaction of the skeptical Freeman (who's likely heard more than his share of Morgan Freeman impersonations) when he finally hears it -- almost to the point of being stunned -- and how clearly impressed he is by the way he involves "Jeff" and urges him on to do more.  (By the way, "Jeff" is performed by Josh Robert Thompson, who uploaded the video...)