By Mandi Bierly
Updated May 05, 2010 at 01:36 PM EDT

Last night, Jimmy Fallon weighed the pros and cons of celebrating Cinco de Mayo. In addition to the requisite drinking jokes, a history lesson, and an Arizona zinger, he gave us an impersonation of Bob Dylan — after he composed himself. (You try saying “Stinkhole Scott Baio” in a Dylan voice. It isn’t easy.) Watch after the jump.